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sql-server-samples/samples/manage/sql-assessment-api/DefaultRuleset.csv
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Aleksei Guzev 6fcc912285 October rule set update 
- Add 14 Azure related rules and probes
- Change 3 severity levels to four: High, Medium, Low, Information
- Fix and improve some rules
- Improve messages and descriptions
2021-11-02 21:13:37 +03:00

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"id","itemType","enabled","level","displayName","message","tags","description","helpLink","target.type","target.platform","target.machineType","target.engineEdition","target.version","target.name","threshold","limit"
"AutoCreateStats","definition","TRUE","Medium","'Auto-Create Statistics' option should be on","Turn on 'Auto-Create Statistics' option to improve query performance","DefaultRuleset, Performance, Statistics, QueryOptimizer","The Query Optimizer determines whether an index is useful for a specific query by evaluating the stored statistics. If the statistics become out of date and significant changes have occurred against the underlying data, this can result in less than optimal query performance. In most cases, it's best to let SQL Server maintain the statistics. If you turn 'Auto Create Stats' and 'Auto Update Stats' off, then it is up to you to keep the statistics up-to-date somehow. Failure to do so will lead to poor query performance. Most applications should have these options ON. When the Auto Create statistics setting is ON, the Query Optimizer creates statistics on one or more columns of a table or an indexed view, as necessary, to improve query plans and query performance.","https://docs.microsoft.com/sql/relational-databases/statistics/statistics#CreateStatistics","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"AutoUpdateStats","definition","TRUE","Medium","Auto-Update Statistics should be on","Turn on 'Auto-Update Statistics' option to improve query performance","DefaultRuleset, Performance, Statistics, QueryOptimizer","The Query Optimizer determines whether an index is useful for a specific query by evaluating the stored statistics. If the statistics become out of date and significant changes have occurred against the underlying data, this can result in less than optimal query performance. In most cases, it's best to let SQL Server maintain the statistics. If you turn 'Auto Create Stats' and 'Auto Update Stats' off, then it is up to you to keep the statistics up-to-date somehow. Failure to do so will lead to poor query performance. Most applications should have these options ON. When the Auto Update Statistics setting is ON, the Query Optimizer updates statistics when they are used by a query and when they might be out-of-date. Statistics become out-of-date after insert, update, delete, or merge operations change the data distribution in the table or indexed view. The Query Optimizer determines when statistics might be out-of-date by counting the number of data modifications since the last statistics update and comparing the number of modifications to a threshold. The threshold is based on the number of rows in the table or indexed view. The Query Optimizer checks for out-of-date statistics before compiling a query and before executing a cached query plan. Before compiling a query, the Query Optimizer uses the columns, tables, and indexed views in the query predicate to determine which statistics might be out-of-date. Before executing a cached query plan, the Database Engine verifies that the query plan references up-to-date statistics. The AUTO_UPDATE_STATISTICS option applies to statistics created for indexes, single-columns in query predicates, and statistics that are created by using the CREATE STATISTICS statement. This option also applies to filtered statistics.","https://docs.microsoft.com/sql/relational-databases/statistics/statistics#UpdateStatistics","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"QueryStoreOn","definition","TRUE","Warning","Query Store should be active","Query Store operation mode should be 'Read Write' to keep performance analysis accurate","DefaultRuleset, Performance, QueryStore, Statistics","The Query Store feature provides you with insight on query plan choice and performance. It simplifies performance troubleshooting by helping you quickly find performance differences caused by query plan changes. Query Store automatically captures a history of queries, plans, and runtime statistics, and retains these for your review. It separates data by time windows so you can see database usage patterns and understand when query plan changes happened on the server. While Query Store collects queries, execution plans and statistics, its size in the database grows until this limit is reached. When that happens, Query Store automatically changes the operation mode to read-only and stops collecting new data, which means that your performance analysis is no longer accurate.","https://docs.microsoft.com/sql/relational-databases/performance/monitoring-performance-by-using-the-query-store","Database","Windows Linux",,"OnPremises, ManagedInstance","[13.0,)","NOT: master tempdb model",,
"TF174","definition","TRUE","Information","TF 174 increases plan cache bucket count","Enable trace flag 174 to increase plan cache bucket count","DefaultRuleset, TraceFlag, Memory, Performance","Trace Flag 174 increases the SQL Server plan cache bucket count from 40,009 to 160,001 on 64-bit systems. When the SQL Server plan cache reaches its entry limit, plans that have low cost must be evicted in order to insert new plans. This can cause severe contention on the SOS_CACHESTORE spinlock and a high CPU usage occurs in SQL Server. On 64-bit systems, the number of buckets for the SQL Server plan cache is 40,009. Therefore, the maximum number of entries that can fit inside the SQL Server plan cache is 160,036. Enabling trace flag 174 on high performance systems increases the size of the cache and can avoid SOS_CACHESTORE spinlock contention.","https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql","Server","Windows Linux",,"OnPremises","[11.0.3368,12.0) [12.0.2480,13.0) [13.0,)",,,
"TF634","definition","TRUE","Information","TF 634 disables background columnstore compression","Trace flag 634 disables background columnstore compression task. Check if you need to set non-default trace flag with current system build and configuration","DefaultRuleset, TraceFlag, Memory, Performance, ColumnStore","Trace Flag 634 disables the background columnstore compression task. SQL Server periodically runs the Tuple Mover background task that compresses columnstore index rowgroups with uncompressed data, one such rowgroup at a time. Columnstore compression improves query performance but also consumes system resources. You can control the timing of columnstore compression manually, by disabling the background compression task with trace flag 634, and then explicitly invoking ALTER INDEX...REORGANIZE or ALTER INDEX...REBUILD at the time of your choice.","https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF652","definition","TRUE","Information","TF 652 disables page pre-fetching scans","Trace flag 652 disables page pre-fetching scans. Check if you need to set non-default trace flag with current system build and configuration","DefaultRuleset, TraceFlag, Performance, Memory, Pages","Trace Flag 652 disables page pre-fetching for scans. The read-ahead process reads the full extent of a referenced database page into the buffer pool, before those contiguous database pages are consumed by scans. Enabling the trace flag can lead to performance issues on queries that leverage pre-fetching.","http://support.microsoft.com/kb/920093","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF661","definition","TRUE","Information","TF 661 disables background ghost cleanup task","Check if you need to set non-default trace flag with current system build and configuration","DefaultRuleset, TraceFlag, Performance","Trace Flag 661 disables the ghost record removal process. A ghost record is the result of a delete operation. When you delete a record, the deleted record is kept as a ghost record. Later, the deleted record is purged by the ghost record removal process. When you disable this process, the deleted record is not purged. Therefore, the space that the deleted record consumes is not freed. This behavior affects space consumption and the performance of scan operations. If you turn off this trace Flag, the ghost record removal process works correctly.","https://support.microsoft.com/help/920093","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF834","definition","TRUE","Information","TF 834 enables large-page allocations","Enable trace flag 834 to use large-page allocations to improve analytical and data warehousing workloads","DefaultRuleset, TraceFlag, Performance, Memory, ColumnStore","Trace Flag 834 causes the server to use large-page memory (LPM) model for the buffer pool allocations. Consider enabling TF 834 if you have a server that has a lot of memory, particularly for an analytical or data warehousing workload. Trace flag 834 is NOT recommended on SQL Server instances that use columnstore indexes.","https://support.microsoft.com/kb/3210239","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF845","definition","TRUE","Warning","TF 845 is not needed in SQL Server 2012 and higher","Disable trace flag 845 in SQL Server 2012 and higher versions","DefaultRuleset, TraceFlag, Memory, Performance","Trace Flag 845 supports locking pages in memory in SQL Server Standard edition, which is needed together with trace flag 834 to use the large-page memory (LPM) model for the buffer pool allocations. Starting with SQL Server 2012 this behavior is enabled by default for Standard edition, and trace flag 845 must not be used.","https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF902","definition","TRUE","Medium","TF 902 Database Upgrade Bypass should be disabled","Disable trace flag 902 which bypasses database upgrade","DefaultRuleset, TraceFlag, UpdateIssues","Trace Flag 902 bypasses execution of database upgrade script when installing a Cumulative Update or Service Pack. This trace flag is not supported to run it continuously in a production environment. If you encounter an error during script upgrade mode, it is recommended to contact Microsoft SQL Customer Service and Support (CSS) for further guidance.","https://support.microsoft.com/help/2163980","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF1117","definition","TRUE","Information","TF 1117 enables filegroup-level autogrow","Enable trace flag 1117 to enable filegroup auto-grow","DefaultRuleset, TraceFlag, DBFileConfiguration, Performance","Trace Flag 1117 initiates the growth of every file in the filegroup, when a file in the filegroup meets the autogrow threshold, and together with trace flag 1118, can help reduce allocation contention in the SQL Server TempDB database. This trace flag affects all databases and is recommended only if every database is safe to be grow all files in a filegroup by the same amount.","https://support.microsoft.com/help/2154845","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF1117","override","TRUE","Warning","TF 1117 has no effect in SQL Server 2016 and higher","Disable trace flag 1117 in SQL Server 2016 and higher versions","","Trace Flag 1117 initiates the growth of every file in the filegroup, when a file in the filegroup meets the autogrow threshold, and together with trace flag 1118, can help reduce allocation contention in the SQL Server TempDB database. Starting with SQL Server 2016, this behavior is controlled by the AUTOGROW_SINGLE_FILE and AUTOGROW_ALL_FILES options of ALTER DATABASE syntax.","https://docs.microsoft.com/sql/t-sql/statements/alter-database-transact-sql-file-and-filegroup-options",,,,,"[13.0,)",,,
"TF1118","definition","TRUE","Information","TF 1118 disables single page allocations","Enable trace flag 1118 to force page allocations on uniform extents","DefaultRuleset, TraceFlag, Memory, Performance, Pages","Trace Flag 1118 forces page allocations on uniform extents instead of mixed extents, and together with trace flag 1117, can help reduce allocation contention in the SQL Server TempDB database. When a new object is created, by default, the first eight pages are allocated from different extents (mixed extents). Afterwards, when more pages are needed, those are allocated from that same extent (uniform extent). The SGAM page is used to track these mixed extents, so can quickly become a bottleneck when numerous mixed page allocations are occurring. This trace flag allocates all eight pages from the same extent when creating new objects, minimizing the need to scan the SGAM page and forces uniform extent allocations instead of mixed page allocations.","https://support.microsoft.com/help/328551","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF1118","override","TRUE","Warning","TF 1118 has no effect in SQL Server 2016 and higher","Disable trace flag 1118 in SQL Server 2016 and higher versions","","Trace Flag 1118 forces page allocations on uniform extents instead of mixed extents, and together with trace flag 1117, can help reduce allocation contention in the SQL Server TempDB database. When a new object is created, by default, the first eight pages are allocated from different extents (mixed extents). Afterwards, when more pages are needed, those are allocated from that same extent (uniform extent). The SGAM page is used to track these mixed extents, so can quickly become a bottleneck when numerous mixed page allocations are occurring. This trace flag allocates all eight pages from the same extent when creating new objects, minimizing the need to scan the SGAM page and forces uniform extent allocations instead of mixed page allocations. Starting with SQL Server 2016, this behavior is controlled by the SET MIXED_PAGE_ALLOCATION option of ALTER DATABASE syntax.","https://docs.microsoft.com/sql/t-sql/statements/alter-database-transact-sql-file-and-filegroup-options",,,,,"[13.0,)",,,
"TF1204","definition","TRUE","Information","TF 1204 returns deadlock information","Disable trace flag 1204 that returns deadlock information","DefaultRuleset, TraceFlag, Locks, Performance","Trace Flag 1204 returns the resources and types of locks that are participating in a deadlock, including the affected command. The resulting information is recorded in the SQL Server Errorlog.","https://support.microsoft.com/help/832524","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF1211","definition","TRUE","Medium","TF 1211 lock escalation should be disabled","Disable trace flag 1211 to enable lock escalation","DefaultRuleset, TraceFlag, Locks, Performance","Trace Flag 1211 disables lock escalation based on memory pressure, or based on number of locks. Because SQL Server will not escalate row or page locks to table locks, this can generate an excessive number of locks. If the lock memory grows large enough, attempts to allocate additional locks for any query may fail and cause performance issues. This trace flag should not be used in order to avoid inability to allocate lock resources because of insufficient memory. If lock escalation needs to be disabled, use trace flag 1224 instead.","https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF1222","definition","TRUE","Information","TF 1222 returns deadlock information","Disable trace flag 1222 that returns deadlock information","DefaultRuleset, TraceFlag, Locks, Performance","Trace Flag 1222 returns the resources and types of locks that are participating in a deadlock, including the affected command. The resulting information is recorded in the SQL Server Errorlog, in XML format that does not comply with any XSD schema.","https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF1224","definition","TRUE","Medium","TF 1224 should be disabled","Disable trace flag 1224 to allow lock escalation","DefaultRuleset, TraceFlag, Locks, Performance","Trace Flag 1224 disables lock escalation based on the number of locks, unless SQL Server is under memory pressure. Because SQL Server will not escalate row or page locks to table locks, this can generate an excessive number of locks.","https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF1229","definition","TRUE","Medium","TF 1229 lock partitioning should be enabled","Disable trace flag 1229 to enable lock partitioning","DefaultRuleset, TraceFlag, Locks, Performance, CPU","Trace Flag 1229 disables lock partitioning regardless of the number of CPUs. By default, SQL Server enables lock partitioning when a server has 16 or more CPUs, to improve the scalability characteristics of larger systems. Disabling lock partitioning may cause can cause spinlock contention and poor performance, or unexpected behaviors when switching partitions.","https://docs.microsoft.com/sql/relational-databases/sql-server-transaction-locking-and-row-versioning-guide","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF1236","definition","TRUE","Medium","TF 1236 database lock partitioning should be enabled","Enable trace Flag 1236 to enable database lock partitioning","DefaultRuleset, TraceFlag, Locks, Performance","Trace Flag 1236 enables database-level lock partitioning. Lock Partitioning is utilized to improve the scalability characteristics on larger systems.","https://support.microsoft.com/help/2926217","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF1236","override","TRUE","Low","TF 1236 is not needed in SQL Server 2012 SP3, SQL Server 2014 SP1 and higher","Disable trace flag 1236 in SQL Server 2012 SP3, SQL Server 2014 SP1 and higher versions","","Trace Flag 1236 enables database-level lock partitioning. Starting with SQL Server 2012 SP3 and SQL Server 2014 SP1, this behavior is controlled by the engine and trace flag 1236 has no effect.",,,,,,"[11.0.6020,12.0) [12.0.4100,)",,,
"TF1462","definition","TRUE","Medium","TF 1462 should be disabled to allow Log Stream Compression","Disable trace flag 1462 to allow log stream compression","DefaultRuleset, TraceFlag, Performance, AvailabilityGroups","Trace Flag 1462 disables log stream compression for asynchronous availability groups. This feature is enabled by default on asynchronous replicas to optimize network bandwidth.","https://docs.microsoft.com/sql/database-engine/availability-groups/windows/tune-compression-for-availability-group","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF2312","definition","TRUE","Low","TF 2312 sets the default cardinality estimation model","Trace Flag 2312 does not apply to this SQL Server version. Check if you need to set a non-default trace flag with the current system build and configuration","DefaultRuleset, TraceFlag, QueryOptimizer, Performance","Trace Flag 2312 sets the Query Optimizer cardinality estimation model to the default version of the database compability level of SQL Server 2014 and higher versions. If the database compatibility level is lower than 120, enabling trace flag 2312 uses the cardinality estimation model of SQL Server 2014 (120).","https://support.microsoft.com/help/2801413","Server","Windows",,"OnPremises","[11.0,)",,,
"TF2312","override","False","Information",,"TF2312 sets the query optimizer cardinality estimation model to SQL Server 2014 or above versions, dependent of the compatibility level of the database","DefaultRuleset, TraceFlag, QueryOptimizer, Performance",,,,,,,"[12.0, )",,,
"TF2330","definition","TRUE","Low","TF 2330 disables recording of index usage stats","Check if you need to disable recording of index usage stats by setting non-default trace flag 2330","DefaultRuleset, TraceFlag, Performance, Indexes","Trace Flag 2330 disables recording of index usage stats, which could lead to a non-yielding condition in SQL 2005.","https://blogs.msdn.microsoft.com/ialonso/2012/10/08/faq-around-sys-dm_db_index_usage_stats","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF2340","definition","TRUE","Information","TF 2340 disables Batch Sorts for optimized nested loops joins","Trace Flag 2340 disables Batch Sorts for optimized nested loops joins","DefaultRuleset, TraceFlag, QueryOptimizer, Performance","Trace Flag 2340 causes SQL Server not to use a sort operation (batch sort) for optimized nested loops joins when generating a plan. Verify need to set a non-default trace flag with the current system build and configuration.","https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF2371","definition","TRUE","Information","TF 2371 enables a linear recompilation threshold for statistics","Enable trace Flag 2371 to allow linear recompilation threshold for statistics","DefaultRuleset, TraceFlag, Performance, Statistics","Trace Flag 2371 causes SQL Server to change the fixed update statistics threshold to a linear update statistics threshold. This is especially useful to keep statistics updated on large tables.","https://docs.microsoft.com/sql/relational-databases/statistics/statistics#auto_update_statistics-option","Server","Windows",,"OnPremises","[11.0,)",,,
"TF2371","override","TRUE","Warning",,,"","Trace Flag 2371 causes SQL Server to change the fixed update statistics threshold to a linear update statistics threshold. This is especially useful to keep statistics updated on large tables. Starting with SQL Server 2016, for databases using compatibility level 130 and above, this behavior is controlled by the engine and trace flag 2371 has no effect.",,,,,,"[13.0,)",,,
"TF2389","definition","TRUE","Information","TF 2389 enables automatic statistics for ascending keys","Check if you need to set non-default trace flag 2389 with current system build and configuration","DefaultRuleset, TraceFlag, Statistics, Performance","Trace Flag 2389 enables automatically generated quick statistics for ascending keys (histogram amendment). This trace flag is recommended to be set in cases where queries access newly inserted ascending key values (such as an IDENTITY column), but the new values are not yet updated in the statistics histogram for the affected columns. In this case the histogram used to estimate cardinality will be adjusted at query compile time. Verify need to set a non-default trace flag with the current system build and configuration.","https://support.microsoft.com/help/2801413","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"TF2390","definition","TRUE","Information","TF 2390 enables automatic statistics for Ascending or Unknown Keys","Trace Flag 2390 enables automatic statistics for ascending or unknown keys. Check if you need to set non-default trace flag with current system build and configuration","DefaultRuleset, TraceFlag, Statistics, Performance, Indexes","Trace Flag 2390 enables automatically generated quick statistics for ascending or unknown keys (histogram amendment). This trace flag is recommended to be set in cases where queries access newly inserted ascending key values (such as an IDENTITY column), but the new values are not yet updated in the statistics histogram for the affected columns. In this case the histogram used to estimate cardinality will be adjusted at query compile time. Verify need to set a non-default trace flag with the current system build and configuration.","https://support.microsoft.com/help/2801413","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"TF2528","definition","TRUE","Low","TF 2528 disables parallel operations for integrity checking","Trace Flag 2528 disables parallel operations for integrity checking, and can cause it to take longer to complete","DefaultRuleset, TraceFlag, DataIntegrity, DBCC","Trace Flag 2528 disables parallel checking of objects by DBCC CHECKDB, DBCC CHECKFILEGROUP, and DBCC CHECKTABLE. By default, the degree of parallelism is automatically determined by the query processor. The maximum degree of parallelism is configured just like that of parallel queries. When parallel checks are disabled, the DBCC commands will take longer to complete. Starting with SQL Server 2014 SP2, a MAXDOP option is available to override the max degree of parallelism configuration option of sp_configure for the DBCC statements.","https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF2549","definition","TRUE","Low","TF 2549 optimizes PHYSICAL_ONLY option of DBCC CHECKDB","Do not use this trace flag unless you know that each file is based on a unique physical disk","DefaultRuleset, TraceFlag, DBCC","Trace Flag 2549 forces the DBCC CHECKDB command to assume each database file is on a unique disk drive but treating different physical files as one logical file. This trace flag can improve the performance when using the PHYSICAL_ONLY option, but it's not recommended unless it is known that each file is based on a unique physical disk.","https://support.microsoft.com/help/2634571","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF2562","definition","TRUE","Low","TF 2562 forces 'DBCC CHECKDB' command to execute in single batch","Disable trace flag 2562, which forces 'DBCC CHECKDB' command to execute in single batch","DefaultRuleset, TraceFlag, DBCC, TempDB","Trace Flag 2562 forces the DBCC CHECKDB command to execute in a single batch regardless of the number of indexes in the database. This trace flag can improve the performance when using the PHYSICAL_ONLY option, but space requirements for TempDB may increase.","https://support.microsoft.com/help/2634571","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF2566","definition","TRUE","Medium","TF 2566 disables default data purity check","Disable trace flag 2566 to turn on default data purity check","DefaultRuleset, TraceFlag, DBCC, DataIntegrity","Trace Flag 2566 forces the DBCC CHECKDB command to execute without data purity check unless the DATA_PURITY option is specified. For databases upgraded from earlier versions of SQL Server, it is recommended to run the DBCC CHECKDB WITH DATA_PURITY command at least once, to enable column-value integrity checks to happen by default.","https://support.microsoft.com/help/945770","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF3023","definition","TRUE","Information","TF 3023 enables Backup Checksum option by default","Disable trace flag 3023 to turn off 'CHECKSUM' option as default for 'BACKUP' command","DefaultRuleset, TraceFlag, Backup","Trace Flag 3023 enables the CHECKSUM option of the BACKUP command by default. This trace flag forces the CHECKSUM option for BACKUP command even when not explicitely set. Starting with SQL Server 2014, this behavior is controlled by setting the Backup Checksum Default configuration option.","https://support.microsoft.com/help/2656988","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF3042","definition","TRUE","Information","TF 3042 bypasses default backup compression pre-allocation algorithm","Disable trace flag 3042 as using this trace flag might cause a slight performance penalty","DefaultRuleset, TraceFlag, Backup","Trace Flag 3042 bypasses the default backup compression pre-allocation algorithm to allow the backup file to grow only as needed to reach its final size. This trace flag can achieve space savings by allocating only the actual size required for the compressed backup, but might increase the overall backup operation time.","https://docs.microsoft.com/sql/relational-databases/backup-restore/backup-compression-sql-server","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF3226","definition","TRUE","Information","TF 3226 disables ErrorLog entries for successful backup operations","Disable trace flag 3226 to prevent SQL Server from recording ErrorLog entries for each successful backup operation","DefaultRuleset, TraceFlag, Backup","Trace Flag 3226 prevents SQL Server from recording an entry to the Errorlog on every successful backup operation. Backup operations are registered in the Errorlog by default. Frequent backup operations can contribute to massive Errorlog files that become unwieldy.","https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF4136","override","TRUE","Information",,"Disable trace flag 4136 to prevent parameter sniffing. Verify need to set non-default trace flag with current system build and configuration","","Trace Flag 4136 disables parameter sniffing unless OPTION(RECOMPILE), WITH RECOMPILE or OPTIMIZE FOR value is used. Starting with SQL Server 2016, to accomplish this at the database level use the PARAMETER_SNIFFING option in ALTER DATABASE SCOPED CONFIGURATION. Verify need to set a non-default trace flag with the current system build and configuration.",,,,,,"[11.0.2316,)",,,
"TF4136","definition","TRUE","Medium","TF 4136 disables parameter sniffing","Trace Flag 4136 does not apply to this SQL Server version. Verify need to set a non-default trace flag with the current system build and configuration","DefaultRuleset, TraceFlag","Trace Flag 4136 disables parameter sniffing unless OPTION(RECOMPILE), WITH RECOMPILE or OPTIMIZE FOR value is used, but does not apply to this SQL Server version. Starting with SQL Server 2016, to accomplish this at the database level use the PARAMETER_SNIFFING option in ALTER DATABASE SCOPED CONFIGURATION. Verify need to set a non-default trace flag with the current system build and configuration.","https://support.microsoft.com/help/980653","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF4137","override","TRUE","Information",,"Disable trace flag 4137 to instruct SQL Server to generate plan using partial correlation of filters. Verify need to set non-default trace flag with the current system build and configuration","","Trace Flag 4137 causes SQL Server to generate a plan using minimum selectivity when estimating AND predicates for filters to account for partial correlation instead of independence, under the query optimizer cardinality estimation model of SQL Server 2012 and earlier versions (CE 70). Does not apply to CE version 120 or above. Use trace flag 9471 instead. Starting with SQL Server 2016 SP1, to accomplish this at the query level use the USE HINT 'ASSUME_MIN_SELECTIVITY_FOR_FILTER_ESTIMATES' query hint. Verify need to set a non-default trace flag with the current system build and configuration.",,,,,,"[11.0.2316,)",,,
"TF4137","definition","TRUE","Warning","TF 4137 causes plans to use partial correlation for filters","Trace flag 4137 does not apply to this SQL Server version. Verify need to set a non-default trace flag with the current system build and configuration","DefaultRuleset, TraceFlag, QueryOptimizer, Performance","Trace Flag 4137 causes SQL Server to generate a plan using minimum selectivity when estimating AND predicates for filters to account for partial correlation instead of independence, under the query optimizer cardinality estimation model of SQL Server 2012 and earlier versions (CE 70). However it does not apply to this SQL Server version. Does not apply to CE version 120 or above. Use trace flag 9471 instead. Starting with SQL Server 2016 SP1, to accomplish this at the query level use the USE HINT 'ASSUME_MIN_SELECTIVITY_FOR_FILTER_ESTIMATES' query hint. Verify need to set a non-default trace flag with the current system build and configuration.","https://support.microsoft.com/help/2658214","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF4138","override","TRUE","Information",,"Trace Flag 4138 enables plan that without row goal adjustments. Verify need to set a non-default trace flag with the current system build and configuration","","Trace Flag 4138 causes SQL Server to generate a plan that does not use row goal adjustments with queries that contain TOP, OPTION (FAST N), IN, or EXISTS keywords. Starting with SQL Server 2016 SP1, to accomplish this at the query level use the USE HINT 'DISABLE_OPTIMIZER_ROWGOAL' query hint. Verify need to set a Non-default trace flag with current system build and configuration.",,,,,,"[11.0.2325,)",,,
"TF4138","definition","TRUE","Warning","TF 4138 causes plans to not use Row Goal adjustments","Trace flag 4138 does not apply to this SQL Server version. Verify need to set a non-default trace flag with the current system build and configuration","DefaultRuleset, TraceFlag, QueryOptimizer, Performance","Trace Flag 4138 causes SQL Server to generate a plan that does not use row goal adjustments with queries that contain TOP, OPTION (FAST N), IN, or EXISTS keywords. Starting with SQL Server 2016 SP1, to accomplish this at the query level use the USE HINT 'DISABLE_OPTIMIZER_ROWGOAL' query hint. However it does not apply to this SQL Server version. Verify need to set a Non-default trace flag with current system build and configuration.","https://support.microsoft.com/help/2667211","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF4139","override","TRUE","Information",,"Trace Flag 4139 enables automatic statistics for any key ordering. Verify need to set a non-default trace flag with the current system build and configuration","","Trace Flag 4139 enables automatically generated quick statistics (histogram amendment) regardless of key column status. This trace flag is recommended to be set in cases where queries access newly inserted key values that may change plan shape, but the new values are not yet updated in the statistics histogram for the affected columns. In this case, regardless of the leading statistics column status (ascending, descending, or stationary), the histogram used to estimate cardinality will be adjusted at query compile time. This trace flag does not apply to the cardinality estimation model of SQL Server 2012 and earlier versions (CE 70). Verify need to set a non-default trace flag with the current system build and configuration.",,,,,,"[11.0.3431,11.0.5058) [11.0.5532,)",,,
"TF4139","definition","TRUE","Warning","TF 4139 enables automatic statistics for any key ordering","Trace flag 4139 does not apply to this SQL Server version. Verify need to set a non-default trace flag with the current system build and configuration","DefaultRuleset, TraceFlag, Statistics","Trace Flag 4139 enables automatically generated quick statistics (histogram amendment) regardless of key column status. However, this trace flag does not apply to this SQL Server version. Verify need to set a non-default trace flag with the current system build and configuration.","https://support.microsoft.com/help/2952101","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF4199","definition","TRUE","Information","TF 4199 enables query optimizer fixes","Trace Flag 4199 enables Query Optimizer fixes. Verify need to set a non-default trace flag with the current system build and configuration","DefaultRuleset, TraceFlag, QueryOptimizer","Trace Flag 4199 enables Query Optimizer fixes released in SQL Server Cumulative Updates and Service Packs.","http://support.microsoft.com/help/974006","Server","Windows Linux",,"OnPremises","[11.0, 14.0)",,,
"TF6498","definition","TRUE","Low","TF 6498 enables additional concurrent large queries","Trace Flag 6498 does not apply to this SQL Server version. Verify need to set a non-default trace flag with the current system build and configuration","DefaultRuleset, TraceFlag, Performance, Memory","Trace Flag 6498 enables more than one large query compilation to gain access to the big gateway when there is sufficient memory available. However, this trace flag does not apply to this SQL Server version. This trace flag can be used to keep memory usage for the compilation of incoming queries under control, avoiding compilation waits for concurrent large queries. Starting with SQL Server 2014 SP2 and SQL Server 2016, this behavior is controlled by the engine and trace flag 1236 has no effect.","https://support.microsoft.com/help/3024815","Server","Windows Linux",,"OnPremises","[12.0.5000,)",,,
"TF6532","definition","TRUE","Information","TF 6532 enables performance improvements for spatial data","Enable trace flag 6532 to enable performance improvements for spatial data","DefaultRuleset, TraceFlag, Performance","Trace Flag 6532 enables performance improvements of query operations with spatial data types. The performance gain will vary, depending on the configuration, the types of queries, and the objects.","https://support.microsoft.com/help/3107399","Server","Windows Linux",,"OnPremises","[11.0.6020,11.0.6518)",,,
"TF6532.6533","override","TRUE","Warning",,"Disable trace flag 6532 in SQL Server 2016 and higher versions.","",,,,,,,"[13.0,)",,,
"TF6532.6533","definition","TRUE","Information","TF 6532 and 6533 improve spatial data performance","Enable trace flags 6532 and 6533 to improve spatial data performance","DefaultRuleset, TraceFlag, Performance","Trace flags 6532 and 6533 enable performance improvements of query operations with spatial data types. The performance gain will vary, depending on the configuration, types of queries, and objects.","https://support.microsoft.com/help/3107399","Server","Windows",,"OnPremises","[11.0,)",,,
"TF6534","override","TRUE","Information",,"Enable trace flag 6534 to enable performance improvement of query operations with spatial data types","","Trace Flag 6534 enables performance improvements of query operations with spatial data types. The performance gain will vary, depending on the configuration, the types of queries, and the objects.",,,,,,"[11.0.6020,12.0) [12.0.5000,13.0)",,,
"TF6534","definition","TRUE","Warning","TF 6534 enables performance improvements for spatial data","Verify need to set a non-default trace flag with the current system build and configuration","DefaultRuleset, TraceFlag, Performance","Trace Flag 6534 enables performance improvement of query operations with spatial data types. However, this trace flag does not apply to this SQL Server version. Verify need to set a Non-default trace flag with current system build and configuration.","https://support.microsoft.com/help/3107399","Server","Windows",,"OnPremises","[11.0,)",,,
"TF7412","definition","TRUE","Information","TF 7412 enables the lightweight profiling infrastructure","Enable trace flag 7412 to enable lightweight profiling infrastructure for live query performance troubleshooting","DefaultRuleset, TraceFlag, Performance","Trace Flag 7412 enables the lightweight profiling infrastructure for live query performance troubleshooting. Consider enabling TF 7412 to have the ability to access runtime information on query execution plans for any session.","https://docs.microsoft.com/sql/relational-databases/performance/query-profiling-infrastructure","Server","Windows Linux",,"OnPremises","[13.0.4001,15.0)",,,
"TF9024","definition","TRUE","Low","TF 9024 converts global log pool memory object","Verify need to set non-default trace flag with current system build and configuration","DefaultRuleset, TraceFlag, Performance, NUMA, Memory, CPU","TF9024 converts a global log pool memory object into NUMA node partitioned memory object.","https://support.microsoft.com/help/2809338/fix-high-log-write-waits-counter-value-on-a-sql-server-2012-or-sql-ser","Server","Windows",,"OnPremises",,,,
"TF9024","override","TRUE","Information",,"Enable trace flag 9024 to convert global log pool memory objects into NUMA node partitioned memory objects","",,,,,,,"[11.0.3349, 11.0.6020) [12.0, 12.0.4100)",,,
"TF9024","override","TRUE","Warning",,"TF9024 is not needed in SQL Server 2012 SP3, SQL Server 2014 SP1 and above.","",,,,,,,"[11.0.6020, 12.0) [12.0.4100,)",,,
"TF8048","definition","TRUE","Low","TF 8048 converts NUMA partitioned memory objects into CPU partitioned","Verify need to set a Non-default TF 8048 with current system build and configuration","DefaultRuleset, TraceFlag, Performance, NUMA, CPU, Memory","TF 8048 converts NUMA partitioned memory objects into CPU partitioned.","https://support.microsoft.com/help/2809338/fix-high-log-write-waits-counter-value-on-a-sql-server-2012-or-sql-ser","Server","Windows",,"OnPremises",,,,
"TF8048","override","TRUE","Warning",,"Disable trace flag 8048 in SQL Server 2014 SP2, SQL Server 2016 and above","",,,,,,,"[12.0.4100,)",,,
"TF8048","override","TRUE","Information",,"Enable trace flag 8048 to convert NUMA partitioned memory objects into CPU partitioned","",,,,,,,"[11.0, 12.0.4100)",,,
"DeprecatedFeatures","definition","TRUE","Warning","Deprecated or discontinued features should not be used","Replace deprecated or discontinued feature @{DeprecatedFeature} with actual features for SQL Server version @{ProductVersion}","DefaultRuleset, Deprecated, Security, UpdateIssues, Performance","This check detects deprecated or discontinued features used on target SQL Server instances. Deprecated features may be removed in a future release of SQL Server. Discontinued features have been removed from specific versions of SQL Server.","https://docs.microsoft.com/sql/relational-databases/performance-monitor/sql-server-deprecated-features-object","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master tempdb model msdb",,
"SystemHealthSession","definition","TRUE","Medium","'system_health' XEvent session is not active","Start system health session by using 'ALTER EVENT SESSION' statement or Extended Events node in Object Explorer","DefaultRuleset, XEvent, SystemHealth","This session starts automatically when the SQL Server Database Engine starts, and runs without any noticeable performance effects. The session collects system data that you can use to help troubleshoot performance issues in the Database Engine. We recommend that you do not stop, alter, or delete the system health session.","https://docs.microsoft.com/sql/relational-databases/extended-events/use-the-system-health-session","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"SPServerDiagnosticsSession","definition","TRUE","Low","'sp_server_diagnostics' xEvent session is not active","Start xEvent session by using 'ALTER EVENT SESSION' statement or Extended Events node in Object Explorer","DefaultRuleset, XEvent, SystemHealth","This session starts automatically when the SQL Server Database Engine starts, and runs without any noticeable performance effects. The session collects system data that you can use to help troubleshoot performance issues in the Database Engine. We recommend that you do not stop, alter, or delete the system health session.","https://docs.microsoft.com/sql/relational-databases/system-stored-procedures/sp-server-diagnostics-transact-sql","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"DefaultTrace","definition","TRUE","Low","Default trace was not found or is inactive","Check if there is enough space on SQL Server to write default trace file, then run default trace by disabling and reenabling it","DefaultRuleset, Traces","Default trace provides troubleshooting assistance to database administrators by ensuring that they have the log data necessary to diagnose problems the first time they occur.","https://docs.microsoft.com/sql/relational-databases/policy-based-management/default-trace-log-files-disabled","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"HintsStatistics","definition","TRUE","Information","Hints are used","Use <join_hint>, <query_hint> and <table_hint> in specific cases only since SQL Server Query Optimizer typically selects best execution plan for queries","DefaultRuleset, QueryOptimizer, Performance, Statistics","Hints are options or strategies specified for enforcement by the SQL Server query processor on SELECT, INSERT, UPDATE, or DELETE statements. The hints override any execution plan the Query Optimizer might select for a query. Because the SQL Server Query Optimizer typically selects the best execution plan for a query, we recommend that <join_hint>, <query_hint>, and <table_hint> be used only as a last resort by experienced developers and database administrators.","https://docs.microsoft.com/sql/t-sql/queries/hints-transact-sql","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"HintsUsageInModules","definition","False","Information","Hints usage in modules","@{Hint} used in @{type_desc} @{Schema_Name}.@{Object_Name}","DefaultRuleset, QueryOptimizer, Performance, Statistics","Hints are options or strategies specified for enforcement by the SQL Server query processor on SELECT, INSERT, UPDATE, or DELETE statements. The hints override any execution plan the Query Optimizer might select for a query. Because the SQL Server Query Optimizer typically selects the best execution plan for a query, we recommend that <join_hint>, <query_hint>, and <table_hint> be used only as a last resort by experienced developers and database administrators.","https://docs.microsoft.com/sql/t-sql/queries/hints-transact-sql","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"PlansUseRatio","definition","TRUE","Medium","Amount of single-use plans in cache is high","Enable 'Optimize for ad hoc workloads' option on heavy OLTP ad-hoc workloads to conserve resources. Current amount of single-use plans in cache is high (@{SingleUsePlansUseRatio:P0})","DefaultRuleset, Performance, QueryOptimizer","The 'Optimize for ad hoc workloads' option helps relieve memory pressure by not allowing the plan cache to become filled with compiled plans that aren't reused.","https://docs.microsoft.com/sql/database-engine/configure-windows/optimize-for-ad-hoc-workloads-server-configuration-option","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,"0.5",
"HypotheticalIndexes","definition","TRUE","Medium","Hypothetical indexes found","Drop hypothetical @{IndexName} index for @{Schema}.@{Object}","DefaultRuleset, Indexes, Performance","Database has indexes that are marked as hypothetical. Hypothetical indexes are created by the Database Tuning Assistant (DTA) during its tests. If a DTA session was interrupted, these indexes may not be deleted. It is recommended to drop these objects as soon as possible.","https://blogs.technet.microsoft.com/anurag_sharma/2008/04/15/hypothetical-indexes","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"HypotheticalStatistics","definition","TRUE","Medium","Hypothetical statistics found","Drop hypothetical @{StatName} statistics for @{Schema}.@{Object}","DefaultRuleset, Statistics","Database has statistics that are marked as hypothetical. Hypothetical statistics are created by the Database Tuning Assistant (DTA) during its tests. If a DTA session was interrupted, these statistics may not be deleted. It is recommended to drop these objects as soon as possible.","https://blogs.technet.microsoft.com/anurag_sharma/2008/04/15/hypothetical-indexes","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"LatestCU","definition","TRUE","Medium","SQL Server instance is not up to date","Update SQL Server and install Service Packs and Cumulative Updates as they are released. Current product version @{ProductVersion} is not up to date","DefaultRuleset, Security, UpdateIssues","On an installed instance of SQL Server, we recommend that you apply the latest security updates and critical updates including general distribution releases (GDRs), service packs (SPs), and cumulative updates (CUs).","https://support.microsoft.com/help/321185/how-to-determine-the-version-edition-and-update-level-of-sql-server-an","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"LatestCU","override","TRUE","Warning","SQL Server instance is up to date","Product version @{ProductVersion} is the latest available","",,"https://support.microsoft.com/help/321185/how-to-determine-the-version-edition-and-update-level-of-sql-server-an",,,,,"[11.0.7507, 12.0) [12.0.6433, 13.0) [13.0.6300, 14.0) [14.0.3411, 15.0) [15.0.4178,)",,,
"FKNoIndexes","definition","TRUE","Medium","Foreign key constraints should have corresponding indexes","Create a corresponding index for each foreign key. There is no index on foreign keys: @{ConstraintName}","DefaultRuleset, Performance, Indexes","Unlike primary key constraints, creating a foreign key constraint does not automatically create a corresponding index. However, manually creating an index on a foreign key is often useful.","https://docs.microsoft.com/sql/relational-databases/tables/primary-and-foreign-key-constraints","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"MissedIndexes","definition","TRUE","Information","Potentially missing indexes","Create index on @{Table} with key columns @{KeyCols}@{IncludedCols: and included columns: #}","DefaultRuleset, Performance, Indexes","Potentially missing indexes were found based on query history. It may be important to revise them.","https://docs.microsoft.com/sql/relational-databases/sql-server-index-design-guide","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"FullBackup","definition","TRUE","Medium","Full backup is missed or outdated","Create full backup. Last full backup is over @{threshold} days old","DefaultRuleset, Backup","Database doesn't have any full backup or the latest full backup is over 7 days old.","https://docs.microsoft.com/sql/relational-databases/backup-restore/create-a-full-database-backup-sql-server","Database","Windows Linux",,"OnPremises","[11.0,)","NOT: model tempdb","7",
"OutdatedTranLogBackup","definition","TRUE","Medium","Transaction Log backup is missed or outdated","Create transaction log backup. Database recovery model: @{recovery_model_desc}","DefaultRuleset, Backup","Database does not have any transaction Log backup since the latest full or differential backup, or it's older than 24H.","https://docs.microsoft.com/sql/relational-databases/backup-restore/back-up-a-transaction-log-sql-server","Database","Windows Linux",,"OnPremises","[11.0,)","NOT: master model msdb tempdb",,
"DbDiffCollation","definition","TRUE","Medium","Database collation doesn't match master collation","Keep database collation the same as master or model collation","DefaultRuleset, DBConfiguration, Collation","We recommend that the collations of user-defined databases match the collation of master or model. Otherwise, collation conflicts can occur that might prevent code from executing. For example, when a stored procedure joins one table to a temporary table, SQL Server might end the batch and return a collation conflict error if the collations of the user-defined database and the model database are different. This occurs because temporary tables are created in tempdb, which bases its collation on that of model.","https://docs.microsoft.com/sql/database-engine/set-collation-user-defined-databases-match-master-model-databases","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"AutoClose","definition","TRUE","Medium","'AUTO_CLOSE' option should be OFF","Set 'AUTO_CLOSE' option to OFF","DefaultRuleset, Performance, DBConfiguration","When AUTO_CLOSE is set ON, this can cause performance degradation on frequently accessed databases because of the increased overhead of opening and closing the database after each connection. AUTO_CLOSE also flushes the procedure cache after each connection.","https://docs.microsoft.com/sql/relational-databases/policy-based-management/set-the-auto-close-database-option-to-off","Database","Windows Linux",,"OnPremises","[11.0,)","NOT: master msdb tempdb",,
"AutoShrink","definition","TRUE","Medium","'AUTO_SHRINK' option should be OFF","Set 'AUTO_SHRINK' option to OFF","DefaultRuleset, DBConfiguration, Performance","Shrinking databases is the fastest way to achieve fragmentation. SQL Server goes to the last page in the database, moves it to the first free available space, and then repeats the process again. This shuffles the deck, putting your pages out of order.","https://blogs.msdn.microsoft.com/buckwoody/2009/07/01/sql-server-best-practices-auto-shrink-should-be-off","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master msdb tempdb",,
"PageVerify","definition","TRUE","Medium","'PAGE_VERIFY' option should be 'CHECKSUM'","Set 'PAGE_VERIFY' option to 'CHECKSUM'","DefaultRuleset, DBConfiguration, DataIntegrity","When CHECKSUM is enabled for the PAGE_VERIFY database option, the SQL Server Database Engine calculates a checksum over the contents of the whole page, and stores the value in the page header when a page is written to disk. When the page is read from disk, the checksum is recomputed and compared to the checksum value that is stored in the page header. This helps provide a high level of data-file integrity.","https://docs.microsoft.com/sql/relational-databases/policy-based-management/set-the-page-verify-database-option-to-checksum","Database","Windows Linux",,"OnPremises","[11.0,)","NOT: master msdb tempdb",,
"DbChaining","definition","TRUE","Medium","Cross-Database access should be disabled","Turn off 'DB_CHAINING' option","DefaultRuleset, DBConfiguration, Security","Ownership chaining across databases is turned off by default. Microsoft recommends that you disable cross-database ownership chaining because it exposes you to the additional security risks.","https://docs.microsoft.com/dotnet/framework/data/adonet/sql/enabling-cross-database-access-in-sql-server","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master msdb tempdb",,
"AutoCreateStatsIncremental","definition","TRUE","Low","Incremental option of auto stats should be ON","Turn on 'AUTO_CREATE_STATISTICS' and 'INCREMENTAL' options","DefaultRuleset, DBConfiguration, Statistics, Performance","Incremental statistics update at partition level is a feature introduced in SQL Server 2014. When the option INCREMENTAL is turn on at the database level, newly auto created column statistics will use incremental statistics on partitioned tables by default.","https://docs.microsoft.com/sql/relational-databases/statistics/statistics","Database","Windows Linux",,"OnPremises, ManagedInstance","[12.0,)","NOT: master msdb tempdb",,
"TrustWorthy","definition","TRUE","Low","'TRUSTWORTHY' should be OFF","Set 'TRUSTWORTHY' option to OFF","DefaultRuleset, DBConfiguration, Security","You can use the TRUSTWORTHY database setting to indicate whether the instance of Microsoft SQL Server trusts the database and the contents within the database. By default, this setting is set to OFF to mitigate certain threats that may be present when a database is attached to the server.","https://support.microsoft.com/help/2183687/guidelines-for-using-the-trustworthy-database-setting-in-sql-server","Database","Windows Linux",,"OnPremises","[11.0,)","NOT: master msdb tempdb",,
"ParameterizationNotSimple","definition","TRUE","Low","'PARAMETERIZATION' should be 'SIMPLE'","Set 'PARAMETERIZATION' to 'SIMPLE' and use forced parameterization only on certain classes of queries instead of all queries","DefaultRuleset, DBConfiguration, Performance, QueryOptimizer","When the PARAMETERIZATION database option is set to SIMPLE, the SQL Server query optimizer may choose to parameterize the queries. This means that any literal values that are contained in a query are substituted with parameters. This process is referred to as simple parameterization. When SIMPLE parameterization is in effect, you cannot control which queries are parameterized and which queries are not. However, you can specify that all queries in a database be parameterized by setting the PARAMETERIZATION database option to FORCED. Regardless of whether you have a Plan-Stability or not, SQL Server will always auto parameterize your SQL Statements, and reuse the cached execution plan over and over again. It doesn't matter how terrible the execution plan is. Therefore you have to know in exact detail the shape of your execution plans, and whether they can lead to some performance related problems.","https://docs.microsoft.com/sql/relational-databases/performance/specify-query-parameterization-behavior-by-using-plan-guides","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master msdb tempdb",,
"TempDBFilesNotSameSize","definition","TRUE","Medium","TempDB data files are not the same size","Make all TempDB data files the same size","DefaultRuleset, TempDB, Performance, DBFileConfiguration","We recommend that you create all TempDB data files at the same size.","https://support.microsoft.com/kb/2154845","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TempDBFilesMultiple4","definition","TRUE","Low","Number of TempDB data files should be in multiples of 4","Make the number of data files be in multiples of 4. For example, 8, 12, 16, and so on, depending on your workloads. Currently you have @{physical_name} TempDB data files ","DefaultRuleset, TempDB, Performance, DBFileConfiguration","Number of TempDB data files should correlate with the number of (logical) processors on the machine. As a general rule, if the number of logical processors is less than or equal to 8, use the same number of data files as logical processors. If the number of logical processors is greater than 8, use 8 data files and then if contention continues, increase the number of data files by multiples of 4 until the contention is reduced to acceptable levels or make changes to the workload/code.","https://support.microsoft.com/kb/2154845","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TempDBFiles1PerCPU","definition","TRUE","Medium","Number of TempDB data files should depend on CPU count","1 data file per logical processor is required (processors count: @{online_logical_processors})","DefaultRuleset, TempDB, Performance, DBFileConfiguration","Number of TempDB data files should correlate with the number of (logical) processors on the machine. As a general rule, if the number of logical processors is less than or equal to 8, use the same number of data files as logical processors. If the number of logical processors is greater than 8, use 8 data files and then if contention continues, increase the number of data files by multiples of 4 until the contention is reduced to acceptable levels or make changes to the workload/code.","https://support.microsoft.com/kb/2154845","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TempDBFilesNotLess8","definition","TRUE","Medium","Number of TempDB data files should be at least 8","Add extra data files to TempDB. There are @{physical_name} data files, should be at least 8","DefaultRuleset, TempDB, Performance, DBFileConfiguration","Number of TempDB data files should correlate with the number of (logical) processors on the machine. As a general rule, if the number of logical processors is less than or equal to 8, use the same number of data files as logical processors. If the number of logical processors is greater than 8, use 8 data files and then if contention continues, increase the number of data files by multiples of 4 until the contention is reduced to acceptable levels or make changes to the workload/code.","https://support.microsoft.com/kb/2154845","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TempDBFilesAutoGrowth","definition","TRUE","Medium","TempDB data files have different auto-growth settings","Make auto-growth settings the same for each TempDB data file","DefaultRuleset, TempDB, Performance, DBFileConfiguration","TempDB data files should be of equal size within each filegroup, as SQL Server uses a proportional-fill algorithm that favors allocations in files with more free space.","https://docs.microsoft.com/sql/relational-databases/databases/tempdb-database","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"FilesAutogrowth","definition","TRUE","Medium","Database files auto-growth over 1GB","Set file growth to less than 1GB for files: @{FileName}","DefaultRuleset, Performance, DBFileConfiguration","A data or log file will be extended with auto-growth value to prevent the lack of free space in files. This process can perform significant impact on SQL Server performance if auto-growth value gets over 1 GB. By default, SQL Server will put zeros to a newly allocated space. And the more space it takes, the more time it takes to initialize it.","https://support.microsoft.com/help/315512/considerations-for-the-autogrow-and-autoshrink-settings-in-sql-server","Database","Windows Linux",,"OnPremises, ManagedInstance","[13.0.4001,)",,,
"DuplicateIndexes","definition","TRUE","Low","Duplicate indexes","Remove duplicate indexes in table @{Table}: @{ToDelete}","DefaultRuleset, Performance, Indexes","A SQL Server index is an on-disk or in-memory structure associated with a table or view that speeds retrieval of rows from the table or view. An index contains keys built from one or more columns in the table or view. ","https://docs.microsoft.com/sql/relational-databases/sql-server-index-design-guide","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"RedundantIndexes","definition","TRUE","Low","Tables with redundant indexes","Remove redundant indexes in table @{Table}: @{Indexes}","DefaultRuleset, Performance, Indexes","There are tables with possibly redundant indexes according to the set of key and included columns. We recommended to revise all these objects as soon as possible.","https://docs.microsoft.com/sql/relational-databases/sql-server-index-design-guide","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"UserObjectsInMaster","definition","TRUE","Warning","User objects in master database","Remove user objects from 'master' database: @{Object_Name}","DefaultRuleset, masterDB, Backup","We highly recommend you not create user objects in the master database. If it's unavoidable for some reason, make sure to back up the database more frequently.","https://docs.microsoft.com/sql/relational-databases/databases/master-database","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","master",,
"HighCPUUsage","definition","TRUE","Medium","High CPU usage on server","Investigate high CPU utilization on server hosting this instance. Last 2 hours: total CPU usage is ~@{AVGTotalCPUUsage}%, usage by SQL Server is ~@{AVGSQLCPUUsage}%","DefaultRuleset, Performance, CPU","Keeping CPU usage rates within normal ranges is vital for servers hosting SQL Server instances. A continually high rate of CPU usage may indicate the need to upgrade the CPU or add multiple processors. Alternatively, a high CPU usage rate may indicate a poorly tuned or designed application. Optimizing the application can lower CPU utilization.","https://docs.microsoft.com/sql/relational-databases/performance-monitor/monitor-cpu-usage","Server","Windows",,"OnPremises, ManagedInstance","[11.0,)",,"70",
"ReplErrors24H","definition","TRUE","Medium","Replication errors within last 24 hours","Review '@{publisher_db}' database replication errors for publications: @{publication}","DefaultRuleset, Replication","This check searches for errors in distribution database agent's history table for the last 24 hours.","https://docs.microsoft.com/sql/relational-databases/replication/sql-server-replication","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"AgentAlertsSeverity10","definition","TRUE","Low","Agent doesn't rise alerts for errors with severity 10","Create alerts for errors: @{error_ids}","DefaultRuleset, Agent","Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.","https://docs.microsoft.com/sql/ssms/agent/alerts","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"AgentAlertsSeverity16","definition","TRUE","Low","Agent doesn't rise alerts for errors with severity 16","Create alerts for errors: @{error_ids}","DefaultRuleset, Agent","Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.","https://docs.microsoft.com/sql/ssms/agent/alerts","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"AgentAlertsSeverity17","definition","TRUE","Low","Agent doesn't rise alerts for errors with severity 17","Create alerts for errors: @{error_ids}","DefaultRuleset, Agent","Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.","https://docs.microsoft.com/sql/ssms/agent/alerts","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"AgentAlertsSeverity19","definition","TRUE","Low","Agent doesn't rise alerts for errors with severity 19","Create alerts for errors: @{error_ids}","DefaultRuleset, Agent","Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.","https://docs.microsoft.com/sql/ssms/agent/alerts","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"AgentAlertsSeverity20","definition","TRUE","Low","Agent doesn't rise alerts for errors with severity 20","Create alerts for errors: @{error_ids}","DefaultRuleset, Agent","Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.","https://docs.microsoft.com/sql/ssms/agent/alerts","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"AgentAlertsSeverity21","definition","TRUE","Low","Agent doesn't rise alerts for errors with severity 21","Create alerts for errors: @{error_ids}","DefaultRuleset, Agent","Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.","https://docs.microsoft.com/sql/ssms/agent/alerts","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"AgentAlertsSeverity22","definition","TRUE","Low","Agent doesn't rise alerts for errors with severity 22","Create alerts for errors: @{error_ids}","DefaultRuleset, Agent","Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.","https://docs.microsoft.com/sql/ssms/agent/alerts","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"AgentAlertsSeverity23","definition","TRUE","Low","Agent doesn't rise alerts for errors with severity 23","Create alerts for errors: @{error_ids}","DefaultRuleset, Agent","Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.","https://docs.microsoft.com/sql/ssms/agent/alerts","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"AgentAlertsSeverity24","definition","TRUE","Low","Agent doesn't rise alerts for errors with severity 24","Create alerts for errors: @{error_ids}","DefaultRuleset, Agent","Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.","https://docs.microsoft.com/sql/ssms/agent/alerts","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"WeakPassword","definition","TRUE","Medium","SQL logins have weak passwords","Set strong passwords for logins: @{PasswordData}","DefaultRuleset, Security, WeakPassword","Some SQL logins have weak passwords. Make sure that you use a strong password for each of your SQL logins to decrease vulnerabilities.","https://docs.microsoft.com/sql/relational-databases/security/strong-passwords","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"VLFCount","definition","TRUE","Medium","VLF count","Update transaction log settings to reduce number of VLFs. Current number is: @{RecoveryUnitId}","DefaultRuleset, Backup, Performance","The SQL Server Database Engine divides each physical log file internally into a number of virtual log files (VLFs). Virtual log files have no fixed size, and there is no fixed number of virtual log files for a physical log file. The Database Engine chooses the size of the virtual log files dynamically while it is creating or extending log files. The Database Engine tries to maintain a small number of virtual files. The size of the virtual files after a log file has been extended is the sum of the size of the existing log and the size of the new file increment. The size or number of virtual log files cannot be configured or set by administrators. If the log files grow to a large size in many small increments, they will have many virtual log files. This can slow down database startup and also log backup and restore operations. Conversely, if the log files are set to a large size with few or just one increment, they will have few very large virtual log files. We recommend that you assign log files a size value close to the final size required, using the required increments to achieve optimal VLF distribution, and also have a relatively large growth_increment value.","https://docs.microsoft.com/sql/relational-databases/sql-server-transaction-log-architecture-and-management-guide","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,"50",
"TF8015","definition","TRUE","Medium","TF 8015 disables auto-detection and NUMA setup","Disable trace flag 8015 for this SQL Server instance. This trace flag does not apply to this SQL Server version","DefaultRuleset, TraceFlag, CPU, NUMA","SQL Server allows you to group CPUs into nodes referred to as soft-NUMA. You usually configure soft-NUMA when you have many CPUs and do not have hardware NUMA, but you can also use soft-NUMA to subdivide hardware NUMA nodes into smaller groups.","https://techcommunity.microsoft.com/t5/SQL-Server-Support/How-It-Works-Soft-NUMA-I-O-Completion-Thread-Lazy-Writer-Workers/ba-p/316044","Server","Windows Linux",,"OnPremises","[11.0,11.0.3349)",,,
"TF8032","definition","TRUE","Medium","TF 8032 reverts cache limit parameters to SQL Server 2005 RTM","Disable trace flag 8032","DefaultRuleset, TraceFlag, Performance","Trace Flag 8032 reverts the cache limit parameters to the SQL Server 2005 RTM setting but can cause poor performance if large caches make less memory available for other memory consumers like BP.",,"Server","Windows Linux",,"OnPremises","[11.0,)",,,
"TF8744","definition","TRUE","Medium","TF 8744 disables pre-fetching for Nested Loop operator","Disable trace flag 8744","DefaultRuleset, TraceFlag, Performance","Trace flag 8744 disables pre-fetching for the Nested Loops operator. Incorrect use of this trace flag may cause additional physical reads when SQL Server executes plans that contain the Nested Loops operator.","https://support.microsoft.com/help/920093/tuning-options-for-sql-server-when-running-in-high-performance-workloa","Server","Windows Linux",,"OnPremises","[11.0,12.0)",,,
"TF9347","definition","TRUE","Medium","TF 9347 disables batch mode for sort operator","Disable trace flag 9347 for this SQL Server instance. This trace flag does not apply to this SQL Server version","DefaultRuleset, TraceFlag, Performance","Trace flag 9347 disables batch mode for sort operator. SQL Server 2016 (13.x) introduced a new batch mode sort operator that boosts performance for many analytical queries.",,"Server","Windows Linux",,"OnPremises","[11.0,13.0)",,,
"TF9349","definition","TRUE","Medium","TF 9349 disables batch mode for top N sort operator","Disable trace flag 9349 for this SQL Server instance. This trace flag does not apply to this SQL Server version","DefaultRuleset, TraceFlag, Performance","Trace flag 9349 disables batch mode for top N sort operator. SQL Server 2016 (13.x) introduced a new batch mode top sort operator that boosts performance for many analytical queries.",,"Server","Windows Linux",,"OnPremises","[11.0,13.0)",,,
"TF9389","definition","TRUE","Medium","TF 9389 enables dynamic memory grant for batch mode operators","Disable trace flag 9389 for this SQL Server instance. The trace flag does not apply to this SQL Server version","DefaultRuleset, TraceFlag, Performance, TempDB","Trace flag 9389 enables additional dynamic memory grant for batch mode operators. If a query does not get all the memory it needs, it spills data to TempDB, incurring additional I/O and potentially impacting query performance. If the dynamic memory grant trace flag is enabled, a batch mode operator may ask for additional memory and avoid spilling to TempDB if additional memory is available.",,"Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,13.0)",,,
"TF9476","definition","TRUE","Medium","TF 9476 causes SQL Server to generate plan using Simple Containment assumption","Disable trace flag 9476 for this SQL Server instance. The trace flag does not apply to this SQL Server version","DefaultRuleset, TraceFlag, Performance, QueryOptimizer","Trace flag 9476 causes SQL Server to generate a plan using the Simple Containment assumption instead of the default Base Containment assumption, under the query optimizer cardinality estimation model of SQL Server 2014 (12.x) through SQL Server 2017 versions.",,"Server","Windows Linux",,"OnPremises","[11.0,13.0)",,,
"TF9481","definition","TRUE","Medium","TF 9481 enables Legacy CE model","Disable trace flag 9481 for this SQL Server instance. The trace flag does not apply to this SQL Server version","DefaultRuleset, TraceFlag, QueryOptimizer, Performance","Trace flag 9481 enables you to set the query optimizer cardinality estimation model to the SQL Server 2012 (11.x) and earlier versions, irrespective of the compatibility level of the database.",,"Server","Windows Linux",,"OnPremises","[11.0,12.0)",,,
"TF10204","definition","TRUE","Medium","TF 10204 disables merge/recompress","Disable trace flag 10204. The trace flag does not apply to this SQL Server version","DefaultRuleset, TraceFlag, Performance, ColumnStore","Trace flag 10204 disables merge/recompress during columnstore index reorganization. In SQL Server 2016 (13.x), when a columnstore index is reorganized, there is new functionality to automatically merge any small compressed rowgroups into larger compressed rowgroups, as well as recompressing any rowgroups that have a large number of deleted rows.",,"Server","Windows Linux",,"OnPremises","[11.0,13.0)",,,
"SPNaming","definition","TRUE","Medium","Stored procedure naming","Rename the following stored procedures to eliminate 'sp_' prefix: @{ObjectName}","DefaultRuleset, Naming","In SQL Server, the sp_ prefix designates system stored procedures. If you use that prefix for your stored procedures, the name of your procedure might conflict with the name of a system stored procedure that will be created in the future. If such a conflict occurs, your application might break if your application refers to the procedure without qualifying the reference by schema. In this situation, the name will bind to the system procedure instead of to your procedure.","https://docs.microsoft.com/previous-versions/visualstudio/visual-studio-2010/dd172115(v=vs.100)","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"ObjectNamingSpecialChar","definition","TRUE","Low","Special characters in object names","Rename the following objects to eliminate special characters: @{ObjectName}","DefaultRuleset, Naming","If you name a database object by using any character in the following table, you make it more difficult not only to reference that object but also to read code that contains the name of that object.","https://docs.microsoft.com/previous-versions/visualstudio/visual-studio-2010/dd172134(v=vs.100)","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"ColumnNamingSpecialChar","definition","TRUE","Low","Special characters in column names","Remove whitespaces, left and right square brackets, single and double quotation marks from column names: @{ObjectName}","DefaultRuleset, Naming","Using whitespaces, left and right square brackets, single and double quotation marks in database object names makes it more difficult not only to reference that object, but also to read code that contains the name of that object.","https://docs.microsoft.com/previous-versions/visualstudio/visual-studio-2010/dd172134(v=vs.100)","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"FnNaming","definition","TRUE","Medium","User function naming","Rename the following functions to eliminate 'fn_ prefix': @{ObjectName}","DefaultRuleset, Naming","In SQL Server, the fn_ prefix designates system functions. If you use that prefix for your functions, the name of your function might conflict with the name of a system function that will be created in the future. If such a conflict occurs, your application might break if your application refers to the function without qualifying the reference by schema. In this situation, the name will bind to the system function instead of to your function.","https://docs.microsoft.com/sql/t-sql/statements/create-function-transact-sql","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"ObjectNamingResKeywords","definition","TRUE","Low","Object names contain reserved keywords","Rename the following objects to eliminate reserved keywords: @{ObjectName}","DefaultRuleset, Naming","Microsoft SQL Server uses reserved keywords for defining, manipulating, and accessing databases. Reserved keywords are part of the grammar of the Transact-SQL language that is used by SQL Server to parse and understand Transact-SQL statements and batches. Although it is syntactically possible to use SQL Server reserved keywords as identifiers and object names in Transact-SQL scripts, you can do this only by using delimited identifiers.","https://docs.microsoft.com/sql/t-sql/language-elements/reserved-keywords-transact-sql","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"DeprFeaturesInModules","definition","TRUE","Low","Deprecated or discontinued features in modules","Remove deprecated or discontinued features in @{ObjectName}: @{Keyword}","DefaultRuleset, Security, Deprecated, LongRunningChecks, UpdateIssues","Deprecated features are scheduled to be removed in a future release of SQL Server. Discontinued features have been removed from specific versions of SQL Server.","https://docs.microsoft.com/sql/relational-databases/performance-monitor/sql-server-deprecated-features-object","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master tempdb model msdb",,
"DeprFeaturesInModules","override","False","Warning",,,"",,,"Database","Windows Linux","AzureSQL",,"[11.0,)",,,
"DeprFeaturesInJobs","definition","TRUE","Low","Deprecated or discontinued features in modules","Remove deprecated or discontinued features in @{ObjectName}: @{Keyword}","DefaultRuleset, Security, Deprecated, Agent, Jobs, LongRunningChecks, UpdateIssues","Deprecated features are scheduled to be removed in a future release of SQL Server. Discontinued features have been removed from specific versions of SQL Server.","https://docs.microsoft.com/sql/relational-databases/performance-monitor/sql-server-deprecated-features-object","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"DeprFeaturesInJobs","override","False","Warning",,,"",,,"Server","Windows Linux","AzureSQL","OnPremises, ManagedInstance","[11.0,)",,,
"NUMANodeSingleCPU","definition","TRUE","Medium","Single CPU assigned to NUMA node","Assign additional CPUs to NUMA nodes with only one CPU","DefaultRuleset, NUMA, CPU, Memory, Performance","Microsoft SQL Server is non-uniform memory access (NUMA) aware. NUMA architecture provides a scalable solution to performance problem. Computers with hardware NUMA have more than one system bus, each serving a small set of processors. Each group of processors has its own memory and possibly its own I/O channels, but each CPU can access memory associated with other groups in a coherent way. Each group is called a NUMA node. The number of CPUs within a NUMA node depends on the hardware vendor. Your hardware manufacturer can tell you if your computer supports hardware NUMA.","https://docs.microsoft.com/previous-versions/sql/sql-server-2008-r2/ms178144(v=sql.105)","Server","Windows",,"OnPremises, ManagedInstance","[11.0,)",,,
"NUMANodeNoCPU","definition","TRUE","Medium","NUMA nodes without CPUs","Assign CPUs to each NUMA node","DefaultRuleset, NUMA, Performance, CPU, Memory","Microsoft SQL Server is non-uniform memory access (NUMA) aware. NUMA architecture provides a scalable solution to performance problem. Computers with hardware NUMA have more than one system bus, each serving a small set of processors. Each group of processors has its own memory and possibly its own I/O channels, but each CPU can access memory associated with other groups in a coherent way. Each group is called a NUMA node. The number of CPUs within a NUMA node depends on the hardware vendor. Your hardware manufacturer can tell you if your computer supports hardware NUMA.","https://docs.microsoft.com/previous-versions/sql/sql-server-2008-r2/ms178144(v=sql.105)","Server","Windows",,"OnPremises, ManagedInstance","[11.0,)",,,
"IndexKeyGuid","definition","TRUE","Low","Guid in clustered index key column","Remove GUIDs in clustered indexes keys: @{IndexName}","DefaultRuleset, Indexes, Performance","A big reason for a clustered index is when you often want to retrieve rows for a range of values for a given column. Because the data is physically arranged in that order, the rows can be extracted very efficiently. Something like a GUID, while excellent for a primary key, could be positively detrimental to performance, as there will be additional cost for inserts and no perceptible benefit on selects.","https://azure.microsoft.com/blog/uniqueidentifier-and-clustered-indexes/","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master tempdb model msdb",,
"IndexesLargeKeys","definition","TRUE","Low","Indexes keys with more than 900 bytes","Remove keys larger than 900 bytes in @{FullName} index","DefaultRuleset, Indexes, Performance","When you design an index that contains many key columns, or large-size columns, calculate the size of the index key to make sure that you do not exceed the maximum index key size. SQL Server retains the 900-byte limit for the maximum total size of all index key columns. This excludes nonkey columns that are included in the definition of nonclustered indexes.","http://msdn.microsoft.com/library/ms191241.aspx","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,13.0)","NOT: master model msdb tempdb",,
"IndexesLargeKeysNonClust","definition","TRUE","Low","NonClustered indexes keys with more than 1700 bytes","Remove keys larger than 1700 bytes in @{FullName} index","DefaultRuleset, Indexes, Performance","When you design an index that contains many key columns, or large-size columns, calculate the size of the index key to make sure that you do not exceed the maximum index key size. SQL Server retains the 1700-byte limit for the maximum total size of all non-clustered index key columns. This excludes nonkey columns that are included in the definition of nonclustered indexes.","http://msdn.microsoft.com/library/ms191241.aspx","Database","Windows Linux",,"OnPremises, ManagedInstance","[13.0,)","NOT: master model msdb tempdb",,
"IndexesLargeKeysClust","definition","TRUE","Low","Clustered indexes keys with more than 900 bytes","Remove keys larger than 900 bytes in @{FullName} index","DefaultRuleset, Indexes, Performance","When you design an index that contains many key columns, or large-size columns, calculate the size of the index key to make sure that you do not exceed the maximum index key size. SQL Server retains the 900-byte limit for the maximum total size of all clustered index key columns. This excludes nonkey columns that are included in the definition of nonclustered indexes.","http://msdn.microsoft.com/library/ms191241.aspx","Database","Windows Linux",,"OnPremises, ManagedInstance","[13.0,)","NOT: master model msdb tempdb",,
"DisabledIndexes","definition","TRUE","Medium","Disabled indexes exist","Remove or enable disabled index: @{FullName}","DefaultRuleset, Indexes, Performance","If you need to load a lot of data quickly, you can disable nonclustered indexes in order to improve performance. After the data load finishes, enable the nonclustered indexes again by rebuilding them. This technique works best in large data warehouse environments where entire dimension tables might be reloaded from scratch every night. Disabling nonclustered indexes is safer than dropping and recreating them because scripting indexes is hard. Unfortunately, sometimes our load processes crash before enabling the indexes again, or sometimes we manually load data and we forget to rebuild them.","https://docs.microsoft.com/sql/relational-databases/indexes/disable-indexes-and-constraints","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"IndexesFillFactor","definition","TRUE","Low","Index fill factor is below 80%","Review index @{FullName} as its fill factor @{FillFactor} is lower than 80 percent","DefaultRuleset, Indexes, Performance","The fill-factor option is provided for fine-tuning index data storage and performance. When an index is created or rebuilt, the fill-factor value determines the percentage of space on each leaf-level page to be filled with data, reserving the remainder on each page as free space for future growth. For example, specifying a fill-factor value of 80 means that 20 percent of each leaf-level page will be left empty, providing space for index expansion as data is added to the underlying table. The empty space is reserved between the index rows rather than at the end of the index.","https://docs.microsoft.com/sql/relational-databases/indexes/specify-fill-factor-for-an-index","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"NonUniqueClusterIndex","definition","TRUE","Medium","Non-unique clustered indexes","Review non-unique @{FullName} clustered index","DefaultRuleset, Indexes, Performance","Index uniqueness is highly desirable attribute of a clustering key, and goes hand-in-hand with index narrowness. SQL Server does not require a clustered index to be unique, but yet it must have some means of uniquely identifying every row. That’s why, for non-unique clustered indexes, SQL Server adds to every duplicate instance of a clustering key value a 4-byte integer value called a uniqueifier. This uniqueifier is added everywhere the clustering key is stored. That means the uniqueifier is stored in both clustered and non-clustered indexes. As you can imagine, if there are many rows using the same clustering key value, this can become quite expensive.","https://docs.microsoft.com/sql/relational-databases/indexes/clustered-and-nonclustered-indexes-described","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"SuspectPages","definition","TRUE","High","Suspect pages found","Run 'DBCC CHECKDB' to verify affected database. Suspect pages were found: @{EventType}","DefaultRuleSet, Pages, DataIntegrity","The suspect_pages table is used for maintaining information about suspect pages, and is relevant in helping to decide whether a restore is necessary.","https://docs.microsoft.com/sql/relational-databases/backup-restore/manage-the-suspect-pages-table-sql-server","Database","Windows Linux",,,"[11.0,)",,,
"SparseFiles","definition","TRUE","Low","Sparse files","Remove sparse files: @{SparseFiles}","DefaultRuleSet, Snapshots, Backup, DataIntegrity","If the file is sparse or compressed, the NTFS file system may deallocate disk space in the file. This sets the range of bytes to zeroes (0) without extending the file size.","https://blogs.msdn.microsoft.com/jorgepc/2010/11/25/what-are-sparse-files-and-why-should-i-care-as-sql-server-dba/","Database","Windows Linux",,,"[11.0,)",,,
"TableNoIndex","definition","TRUE","Low","Tables without indexes","Review @{TableName} table and create reasonable indexes","DefaultRuleset, Indexes, Performance","Each table in the database has one or more pages. To keep track of those pages, SQL Server uses a special set of pages, called IAM (for Index Allocation Map) pages. In spite of the word “Index” in the name, IAMs are used for non-indexed tables as well. These are called heaps. All the data is there, but the only way to find anything is to read it starting at the beginning. For a very large table, this will be terribly inefficient.","https://docs.microsoft.com/sql/relational-databases/indexes/heaps-tables-without-clustered-indexes","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master tempdb model msdb",,
"TableNoClusteredIndex","definition","TRUE","Low","Tables without clustered indexes","Review @{TableName} table and create clustered index","DefaultRuleset, Indexes, Performance","Tables without clustered indexes are called heaps. They’re scattered on disk anywhere that SQL Server can find a spot, and they’re not stored in any order whatsoever. This can make for really fast inserts – SQL Server can just throw the data down – but slow selects, updates, and deletes.","https://docs.microsoft.com/sql/relational-databases/indexes/heaps-tables-without-clustered-indexes","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master tempdb model msdb",,
"TablePSAlign","definition","TRUE","Low","Table index not aligned with PS","Re-create @{IndexName} index in @{TableName} table to have it aligned with current schema","DefaultRuleset, Indexes, Performance","Table partitioning is a complex way to break out your large tables into smaller, more manageable chunks, but it comes with a lot of management heartache. One of the challenges is making sure that your indexes are partitioned and aligned the same way as your clustered index.","https://docs.microsoft.com/sql/relational-databases/partitions/partitioned-tables-and-indexes","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master tempdb model msdb",,
"LoginNoPassword","definition","False","Warning","SQL logins have no passwords","Set strong passwords for logins: @{PasswordData}","DefaultRuleset, Security, WeakPassword","Password complexity policies are designed to deter brute force attacks by increasing the number of possible passwords. Make sure that you use a strong password for each of your SQL logins to decrease vulnerabilities.","https://docs.microsoft.com/sql/relational-databases/security/password-policy","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"LoginEqPassword","definition","False","Warning","Passwords and SQL login names are the same","Review logins that have passwords equal to SQL login names: @{PasswordData}","DefaultRuleset, Security, WeakPassword","Password complexity policies are designed to deter brute force attacks by increasing the number of possible passwords. Make sure that you use passwords that are different from your SQL login names.","https://docs.microsoft.com/sql/relational-databases/security/password-policy","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"SystemHealth","definition","TRUE","High","System Health important messages","Error @{Error_Number} occured @{Error_Count} times. Last time was @{Last_Logged_Days_Ago} days ago","DefaultRuleset, XEvent, SystemHealth, Performance","The system_health session is an Extended Events session that is included by default with SQL Server. This session starts automatically when the SQL Server Database Engine starts, and runs without any noticeable performance effects. The session collects system data that you can use to help troubleshoot performance issues in the Database Engine","https://docs.microsoft.com/sql/relational-databases/extended-events/use-the-system-health-session","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"RarelyUsedIndex","definition","TRUE","Low","Rarely used index","Revise rarely used index @{IndexName}","DefaultRuleset, Indexes, Performance","Rarely used indexes can slow down database's performance. Time of write operations is increased because of index maintenance, but index is not used quite often. It makes sense to compare impact of writing operations versus rare reading speedup.","https://docs.microsoft.com/sql/t-sql/statements/drop-index-transact-sql","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"UnusedIndex","definition","TRUE","Medium","Unused index","Revise unused @{IndexName} index on @{TableName} table","DefaultRuleset, Index, Performance","Unused indexes can slow down database's performance. Time of write operations is increased because of index maintenance, but index is not used anywhere.","https://docs.microsoft.com/sql/t-sql/statements/drop-index-transact-sql","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"SkewedCompatibilityLevel","definition","TRUE","Low","Database with skewed compatibility level","Update database compatibility level. Current level is @{CompatibilityLevel}","DefaultRuleset, CompatibilityLevel, Security, Performance, UpdateIssues","Some databases may have a compatibility level lower than the allowed level by the Database Engine.","https://docs.microsoft.com/sql/t-sql/statements/alter-database-transact-sql-compatibility-level","Database","Windows Linux",,,"[11.0,)",,,
"PendingDiskIORequests","definition","TRUE","Medium","Pending disk I/O requests","Solve I/O related issues to get rid of pending requests","DefaultRuleset, IO, Performance","A database management system (DBMS), such as SQL Server, relies on the timeliness of file input and output (I/O) operations. The proper configuration and maintenance of the I/O subsystem is critical to a successful SQL Server deployment.","https://support.microsoft.com/en-sg/help/897284/diagnostics-in-sql-server-help-detect-stalled-and-stuck-i-o-operations","Server","Windows Linux",,,"[11.0,)",,,
"MaxDOP","definition","TRUE","Medium","MaxDOP should be less or equal to number of CPUs","Update MaxDOP configuration option value: @{max_dop}. It shouldn't exceed @{online_logical_processors} - number of processors used by SQL Server","DefaultRuleset, MaxDOP, Performance, Configuration, NUMA, CPU","The Microsoft SQL Server max degree of parallelism (MAXDOP) configuration option controls the number of processors that are used for the execution of a query in a parallel plan. This option determines the number of threads that are used for the query plan operators that perform the work in parallel. Depending on whether SQL Server is set up on a symmetric multiprocessing (SMP) computer, a non-uniform memory access (NUMA) computer, or hyperthreading-enabled processors, the max degree of parallelism option should be configured appropriately.","https://support.microsoft.com/kb/2806535","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"MaxDOPFewNUMA","definition","TRUE","Low","MAXDOP set in accordance with CPU count","Update MAXDOP configuration option value: @{max_dop}. It should not exceed the number of logical processors per NUMA node","DefaultRuleset, MaxDOP, Performance, Configuration, NUMA, CPU","The Microsoft SQL Server max degree of parallelism (MAXDOP) configuration option controls the number of processors that are used for the execution of a query in a parallel plan. This option determines the number of threads that are used for the query plan operators that perform the work in parallel. Depending on whether SQL Server is set up on a symmetric multiprocessing (SMP) computer, a non-uniform memory access (NUMA) computer, or hyperthreading-enabled processors, the max degree of parallelism option should be configured appropriately.","https://support.microsoft.com/kb/2806535","Server","Windows Linux",,"OnPremises","[11.0, 13.0)",,,
"DbIntegrity","definition","TRUE","Medium","Database Integrity Checks","Run 'DBCC CHECKDB' command checks","DefaultRuleset, DBCC, Performance, DataIntegrity","The DBCC CHECKDB command checks the integrity of the objects in a database and should be run on a regular basis. This statement is used to perform different operations in your database and can be broken down into four categories: Maintenance, Miscellaneous, Informational, and Validation.","https://msdn.microsoft.com/library/ms176064.aspx","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: tempdb",,
"DirectCatalogUpdates","definition","TRUE","Low","Direct Catalog Updates","Avoid using direct catalog update feature","DefaultRuleset, DBCC, Deprecated","The 'allow updates' option is still present in the sp_configure stored procedure, although its functionality is unavailable in SQL Server. The setting has no effect. Starting with SQL Server 2005, direct updates to the system tables are not supported.","https://docs.microsoft.com/sql/database-engine/configure-windows/allow-updates-server-configuration-option","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: tempdb",,
"DataPurityCheck","definition","TRUE","Low","Data Purity Check","Enable data purity validation with 'DBCC CHECKDB ([DatabaseName]) WITH DATA_PURITY' command","DefaultRuleset, DBCC, DataIntegrity","The DBCC CHECKDB command checks the integrity of the objects in a database and should be run on a regular basis. One thing that this command does not check in databases created in versions prior to SQL Server 2005 is the integrity of the data in the columns until it has been run once with the DATA_PURITY option. Adding the DATA_PURITY option causes the CHECKDB command to look for column values that are invalid or out of range. Any database that was created in SQL Server 2005 or later will include the DATA_PURITY check by default; but if the database is being upgraded from an earlier version, you must run the command with the DATA_PURITY option at least once using the following command and then fix any data issues.","http://support.microsoft.com/kb/923247","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"StatSamplingRate","definition","TRUE","Low","Statistics sampling rate","Some statistics have sampling rates less than @{threshold:P}. Update with a larger sample or full scan if key is not uniformly distributed. Affected tables: @{FullName}","DefaultRuleset, Performance, Statistics","For most queries, the Query Optimizer already generates the necessary statistics for a high quality query plan; in some cases, you need to create additional statistics or modify the query design for best results.","https://docs.microsoft.com/sql/t-sql/statements/update-statistics-transact-sql","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,"0.25",
"IndexFragmentation","definition","TRUE","Medium","Index Fragmentation","Remove fragmentation of @{IndexFullName} index. Current fragmentation level is @{fragmentation:#0.##}%","DefaultRuleset, Index, Performance","The SQL Server Database Engine automatically modifies indexes whenever insert, update, or delete operations are made to the underlying data. Over time these modifications can cause the information in the index to become scattered in the database (fragmented). Fragmentation exists when indexes have pages in which the logical ordering, based on the key value, does not match the physical ordering inside the data file. Heavily fragmented indexes can degrade query performance and cause your application to respond slowly, especially scan operations.","https://docs.microsoft.com/sql/relational-databases/indexes/reorganize-and-rebuild-indexes","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb","5",
"IndexFragmentation","override","TRUE","Warning",,,"",,,,,,,"[12.0,)",,,
"XTPHashAvgChainBuckets","definition","TRUE","Medium","High avg chain length and empty buckets","Index @{IndexFullName} has @{avg_chain_length} average chain length and @{EmptyBucketPct}% empty buckets count. Verify if there are many rows with duplicate index key values or there is a skew in key values","DefaultRuleset, Index, Performance, XTP","Memory-optimized HASH indexes behave different from NONCLUSTERED indexes. They are optimized for point-lookup operations, and do not support ordered scans or inequality seek operations. You should specify a value for the BUCKET_COUNT parameter when you create a memory-optimized table.","https://techcommunity.microsoft.com/t5/sql-server/in-memory-oltp-indexes-part-2-performance-troubleshooting-guide/ba-p/385725","Database","Windows Linux",,"OnPremises, ManagedInstance","[12.0,)","NOT: master model msdb tempdb",,
"XTPTooManyBuckets","definition","TRUE","Low","Too many buckets","Make number of buckets of @{IndexFullName} index equal to distinct rows. It has @{total_bucket_count} buckets and there are @{DistinctCnt} in table, which wastes memory and marginally slows down full table scans","DefaultRuleset, Index, Performance, XTP","Memory-optimized HASH indexes behave different from NONCLUSTERED indexes. They are optimized for point-lookup operations, and do not support ordered scans or inequality seek operations. You must specify a value for the BUCKET_COUNT parameter when you create the memory-optimized table.","https://techcommunity.microsoft.com/t5/sql-server/in-memory-oltp-indexes-part-2-performance-troubleshooting-guide/ba-p/385725","Database","Windows Linux",,"OnPremises, ManagedInstance","[12.0,)","NOT: master model msdb tempdb",,
"XTPTooFewBuckets","definition","TRUE","Medium","Too few buckets","Make number of buckets of @{IndexFullName} index equal to distinct rows. It has @{total_bucket_count} buckets and there are @{DistinctCnt} in table, which leads to chaining records","DefaultRuleset, Index, Performance, XTP","Memory-optimized HASH indexes behave different from NONCLUSTERED indexes. They are optimized for point-lookup operations, and do not support ordered scans or inequality seek operations. You must specify a value for the BUCKET_COUNT parameter when you create the memory-optimized table.","https://techcommunity.microsoft.com/t5/sql-server/in-memory-oltp-indexes-part-2-performance-troubleshooting-guide/ba-p/385725","Database","Windows Linux",,"OnPremises, ManagedInstance","[12.0,)","NOT: master model msdb tempdb",,
"XTPRangeIXHealth","definition","TRUE","Low","NonClustered index retry amount","Review @{IndexFullName} index as its retry count is over @{RetryCountPct}% of total, which indicates possible concurrency issues","DefaultRuleset, Index, Performance, XTP","When a database with a memory-optimized table is restarted, the index is built by inserting one row at a time into memory. The count of page splits, merges, and consolidation can help you understand the work done to build the index when a database is brought online. Large numbers of retries are indicative of concurrency issues.","https://docs.microsoft.com/sql/relational-databases/system-dynamic-management-views/sys-dm-db-xtp-nonclustered-index-stats-transact-sql","Database","Windows Linux",,"OnPremises, ManagedInstance","[12.0,)","NOT: master model msdb tempdb",,
"TF6533Misuse","definition","TRUE","Low","'STRelate' and 'STAsBinary' functions unexpected results due to TF 6533","Disable trace flag 6533 to avoid unexpected results of 'STRelate' and 'STAsBinary' functions","DefaultRuleset, TraceFlag, Performance, TF6533","The STRelate and STAsBinary functions may return unexpected results when trace flag 6533 is enabled. Do not use this trace flag if your workload involves either of these functions.","https://support.microsoft.com/help/3107399","Database","Windows Linux",,"OnPremises","[11.0.6020, 11.0.6518)","NOT: master model msdb tempdb",,
"UntrustedConstraints","definition","TRUE","Low","Untrusted constraints","Execute 'ALTER TABLE <table name> WITH CHECK CHECK CONSTRAINT <constraint name>' statement to avoid possible performance issues: @{constraint_name} constraints are not trusted for referential integrity","DefaultRuleset, Performance, DataIntegrity","If you need to load a lot of data quickly, you can disable keys and constraints in order to improve performance. After the data load finishes, enable them again, and SQL Server will check them behind the scenes. This technique works best in large data warehouse environments where entire dimension tables might be reloaded from scratch every night. Disabling constraints is usually safer and easier than dropping and recreating them.","https://docs.microsoft.com/sql/t-sql/statements/alter-table-transact-sql","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)","NOT: master model msdb tempdb",,
"PercentAutogrows","definition","TRUE","Low","Database files have growth ratio in percentage","Do not use ""File Growth In Percent"" for Autogrowth setting. Affected files: @{fileName} have growth ratio set in percentage","DefaultRuleset, Performance, DBFileConfiguration, DBConfiguration","Some database files have a growth ratio set in percentage. Over time, this could lead to uncontrolled disk space allocation and extended time to perform these growths","https://docs.microsoft.com/sql/t-sql/statements/alter-database-transact-sql-file-and-filegroup-options","Database","Windows Linux",,"OnPremises","[11.0,)","NOT: master model msdb tempdb",,
"StatsUpdate","definition","TRUE","Warning","Statistics need to be updated","Update stats in @{TableName} table to improve query performance","DefaultRuleset, Performance, Statistics, QueryOptimizer","The Query Optimizer determines whether an index is useful for a specific query by evaluating the stored statistics. If the statistics become out of date and significant changes have occurred against the underlying data, this can result in less than optimal query performance. In most cases, it's best to let SQL Server maintain the statistics. If you turn 'Auto Create Stats' and 'Auto Update Stats' off, then it is up to you to keep the statistics up-to-date somehow. Failure to do so will lead to poor query performance. Most applications should have these options ON. When the Auto Update Statistics setting is ON, the Query Optimizer updates statistics when they are used by a query and when they might be out-of-date. Statistics become out-of-date after insert, update, delete, or merge operations change the data distribution in the table or indexed view. The Query Optimizer determines when statistics might be out-of-date by counting the number of data modifications since the last statistics update and comparing the number of modifications to a threshold. The threshold is based on the number of rows in the table or indexed view. The Query Optimizer checks for out-of-date statistics before compiling a query and before executing a cached query plan. Before compiling a query, the Query Optimizer uses the columns, tables, and indexed views in the query predicate to determine which statistics might be out-of-date. Before executing a cached query plan, the Database Engine verifies that the query plan references up-to-date statistics. The AUTO_UPDATE_STATISTICS option applies to statistics created for indexes, single-columns in query predicates, and statistics that are created by using the CREATE STATISTICS statement. This option also applies to filtered statistics.","https://docs.microsoft.com/sql/relational-databases/statistics/statistics#UpdateStatistics","Database","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,"500",
"AdHocQueriesOff","definition","TRUE","Low","Option 'ad hoc distributed queries' should be disabled","Disable 'ad hoc distributed queries' option","DefaultRuleset, Configuration, Security","Ad Hoc Distributed Queries use the OPENROWSET and OPENDATASOURCE functions to connect to remote data sources that use OLE DB. OPENROWSET and OPENDATASOURCE should be used only to reference OLE DB data sources that are accessed infrequently. For any data sources that will be accessed more than several times, define a linked server. Enabling the use of ad hoc names means that any authenticated login to SQL Server can access the provider. SQL Server administrators should enable this feature for providers that are safe to be accessed by any local login.","https://docs.microsoft.com/sql/database-engine/configure-windows/ad-hoc-distributed-queries-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"AffinityMasksOverlap","definition","TRUE","Low","Affinity Mask and Affinity I/O Mask overlapping","Correct Affinity Mask and Affinity IO Mask overlap. AffinityMask = @{affinity_mask}, Affinity64Mask = @{affinity64_mask}, AffinityIOMask = @{affinity_io_mask}, Affinity64IOMask = @{affinity64_io_mask}","DefaultRuleset, Configuration, Performance","Enabling a CPU with both the affinity mask and the affinity I/O mask can slow performance by forcing the processor to be overused. When specified either the affinity mask or the affinity I/O mask options they must both be specified, but only enables each CPU no more than once. The same CPU should not be enabled in both the affinity mask option and the affinity I/O mask option. The bits that correspond to each CPU should be in one of the following states.","https://docs.microsoft.com/sql/relational-databases/policy-based-management/correct-affinity-mask-and-affinity-input-and-output-mask-overlap","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"AgentSvcAccNotRecommended","definition","TRUE","Low","'SQL Server Agent' service uses non-recommended account","Use another account to run 'SQL Server Agent' service. Current account '@{attr::service::SQLAgent.account}' is not recommended","DefaultRuleset, Configuration","Running the 'SQL Server Agent' service under 'NT AUTHORITY\SYSTEM' or 'NT AUTHORITY\NETWORKSERVICE' accounts is not recommended for security reasons.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions","Server","Windows",,"OnPremises","[11.0,)",,,
"AgentSvcAccNotRecommended","override","False","Warning",,,"",,,,,,"Express",,,,
"AgentSvcAccNotSupported","definition","TRUE","Low","'SQL Server Agent' service uses not supported account","Use another account to run 'SQL Server Agent' service. Current account '@{attr::service::SQLAgent.account}' is not supported","DefaultRuleset, Configuration","Running the 'SQL Server Agent' service under 'NT AUTHORITY\LOCALSERVICE', 'NT AUTHORITY\SYSTEM' or 'NT AUTHORITY\NETWORKSERVICE' accounts is not supported.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions","Server","Windows",,"OnPremises","[11.0,)",,,
"AgentSvcAccNotSupported","override","False","Warning",,,"",,,,,,"Express",,,,
"AgentSvcAccSame","definition","TRUE","Low","'SQL Server Agent' and 'SQL Server Database Engine' use same account","Use different accounts for 'SQL Server Agent' service and 'SQL Server Database Engine' service. Now both services use '@{attr::service::SQLAgent.account}' account","DefaultRuleset, Configuration","Running the 'SQL Server Agent' service under the same account as the 'SQL Server Database Engine' service is not recommended.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions","Server","Windows",,"OnPremises","[11.0,)",,,
"AgentSvcAccSame","override","False","Warning",,,"",,,,,,"Express",,,,
"AgentSvcStoped","definition","TRUE","Low","'SQL Server Agent' service is stopped","Run 'SQL Server Agent' service","DefaultRuleset, Configuration","The 'SQL Server Agent' service executes jobs, monitors SQL Servers, fires alerts and enables automation for some administrative tasks.","https://docs.microsoft.com/sql/database-engine/configure-windows/manage-the-database-engine-services","Server","Windows",,"OnPremises","[11.0,)",,,
"AgentSvcStoped","override","False","Warning",,,"",,,,,,"Express",,,,
"AutoSoftNUMAOn","definition","TRUE","Low","Auto Soft NUMA should be enabled","Turn 'automatic soft-NUMA disabled' option on to avoid inefficient allocation of cores between NUMA nodes","DefaultRuleset, Configuration, NUMA","Modern processors have multiple cores per socket. Each socket is represented, usually, as a single NUMA node. The SQL Server database engine partitions various internal structures and partitions service threads per NUMA node. With processors containing 10 or more cores per socket, using software NUMA to split hardware NUMA nodes generally increases scalability and performance. Prior to SQL Server 2014 (12.x) SP2, software-based NUMA (soft-NUMA) has required to edit the registry to add a node configuration affinity mask, and was configured at the host level, rather than per instance. Soft-NUMA has configured automatically at the database-instance level when the SQL Server Database Engine service starts.","https://docs.microsoft.com/sql/database-engine/configure-windows/soft-numa-sql-server","Server","Windows Linux",,"OnPremises","[13.0,)",,,
"AzSqlVmSize","definition","TRUE","Information","VM size is not memory-optimized","Use memory optimized virtual machine sizes for the best performance of SQL Server workloads","DefaultRuleset, SqlOnVm, Azure, Performance","Memory optimized VM sizes offer a high memory-to-CPU ratio that is great for relational database servers. The DSv2 11-15, Edsv4 series, the M-, and the Mv2- series offer the optimal memory-to-vCore ratio required for OLTP workloads. Both M series VMs offer the highest memory-to-vCore ratio required for mission critical workloads and is also ideal for data warehouse workloads.","https://docs.microsoft.com/azure/azure-sql/virtual-machines/windows/performance-guidelines-best-practices","Server",,"AzureSQL",,,,,
"BlockingChains","definition","TRUE","Low","Blocking chains","Review locking strategy. @{blocked_spid} process(es) have been blocked@{block_time_min: for more than #0 min;;''}","DefaultRuleset, Statistics","Blocking chains of sessions can cause poor performance when the duration of locks is too long on the resource.","https://docs.microsoft.com/sql/relational-databases/system-dynamic-management-views/sys-dm-os-waiting-tasks-transact-sql","Database","Windows Linux",,"OnPremises","[11.0,)",,,
"BlockProcThreshNotRecommend","definition","TRUE","Low","Blocked process threshold is set to recommended value","Increase or disable blocked process threshold option. Current value is @{block_threshold}","DefaultRuleset, Configuration","This rule checks that the blocked process threshold option is set to 0 (disabled) or set to a value higher than or equal to 5 (seconds). Setting the blocked process threshold option to a value from 1 to 4 can cause the deadlock monitor to run constantly. Values 1 to 4 should only be used for troubleshooting, and never long term or in a production environment without the assistance of Microsoft Customer Service and Support.","https://docs.microsoft.com/sql/relational-databases/policy-based-management/increase-or-disable-blocked-process-threshold","Server","Windows Linux",,"OnPremises","[11.0,)",,"5",
"BrowserSvcAccSame","definition","TRUE","Low","'SQL Server Browser' and 'SQL Server Database Engine' use same account","Use different accounts for 'SQL Server Browser' and 'SQL Server Database Engine'. Now both services use '@{attr::service::SQLBrowser.account}' account","DefaultRuleset, Configuration","Running the 'SQL Server Browser' service under the same account as the 'SQL Server Database Engine' service is not recommended.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions","Server","Windows",,"OnPremises","[11.0,)",,,
"BrowserSvcStoped","definition","TRUE","Low","'SQL Server Browser' service is stopped","Run 'SQL Server Browser' service","DefaultRuleset, Configuration","The 'SQL Server Browser' service is a name resolution service that provides SQL Server connection information to client computers.","https://docs.microsoft.com/sql/database-engine/configure-windows/manage-the-database-engine-services","Server","Windows",,"OnPremises","[11.0,)",,,
"CrossDBOwnershipOff","definition","TRUE","Low","Option 'cross db ownership chaining' should be disabled","Disable 'cross db ownership chaining' option","DefaultRuleset, Configuration, Security","Cross-database ownership chaining occurs when a procedure in one database depends on objects in another database. A cross-database ownership chain works in the same way as ownership chaining within a single database, except that an unbroken ownership chain requires that all the object owners are mapped to the same login account. If the source object in the source database and the target objects in the target databases are owned by the same login account, SQL Server does not check permissions on the target objects. Ownership chaining across databases is turned off by default. Microsoft recommends that you disable cross-database ownership chaining because it exposes you to some security risks.","https://docs.microsoft.com/dotnet/framework/data/adonet/sql/enabling-cross-database-access-in-sql-server","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"DefaultTraceOff","definition","TRUE","Low","Default trace is enabled","Enable 'default trace enabled' option to get troubleshooting assistance","DefaultRuleset, Configuration","Use the 'default trace enabled' option to enable or disable the default trace log files. The default trace functionality provides a rich, persistent log of activity and changes primarily related to the configuration options. ","https://docs.microsoft.com/sql/database-engine/configure-windows/default-trace-enabled-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"DiskFragmentationAnalysis","definition","TRUE","Low","Disk fragmentation analysis","Defragment volume '@{Output.Name}' with physical fragmentation","DefaultRuleset, Configuration","If you do not defragment your hard disk, the operating system may have to go to several physical locations on the disk to retrieve the database file, making file access slower. To get information about the fragmentation level, this check requires the destination SQL Server to be running under the sysadmin account.","https://support.microsoft.com/help/3195161/defragmenting-sql-server-database-disk-drives","Server","Windows",,"OnPremises","[11.0,)",,,
"DiskPartitionAlignment","definition","TRUE","Low","Disk Partition alignment","Increase disk partition alignment on @{Output.Name} to make it 64 KB at least. Current volume offset is @{Output.StartingOffset}","DefaultRuleset, Performance, Storage","Noncompliance with storage configuration best practices for the Microsoft SQL Server database software is a common root cause of support cases. The reason is often shown to be misalignment between Windows, storage, disk controllers, and cache segment lines. 64 KB is a common, valid starting partition offset because it correlates well with fundamental physical boundaries in disks, controllers, and cache. Other valid starting partition offsets exist.","https://docs.microsoft.com/previous-versions/sql/sql-server-2008/dd758814(v=sql.100)","Server","Windows",,"OnPremises","[11.0,)",,"65536",
"DtsSvcAccSame","definition","TRUE","Low","'Integration Services' and 'SQL Server Database Engine' use same account","Use different accounts for 'Integration Services' service and 'SQL Server Database Engine' service. Now both services use '@{attr::service::MsDtsServer.account}' account","DefaultRuleset, Configuration","Running the 'Integration Services' service under the same account as the 'SQL Server Database Engine' service is not recommended.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions","Server","Windows",,"OnPremises","[11.0,)",,,
"DtsSvcStoped","definition","TRUE","Low","'Integration Services' service is stopped","Run 'Integration Services' service","DefaultRuleset, Configuration","The 'Integration Services' service provides management support for Integration Services package storage and execution.","https://docs.microsoft.com/sql/database-engine/configure-windows/manage-the-database-engine-services","Server","Windows",,"OnPremises","[11.0,)",,,
"ErrorLogSize","definition","TRUE","Low","Error log file size is too big","Cycle error log files or revise error log settings. Current error log file size is more than @{threshold} MB.","DefaultRuleset, Configuration, Performance","Cycling error log files makes it easier to read the error log.","https://docs.microsoft.com/sql/tools/configuration-manager/viewing-the-sql-server-error-log","Server","Windows Linux",,"OnPremises","[11.0,)",,"50",
"FullTextServiceLoadOSResources","definition","TRUE","Low","Full-text search option 'load_os_resources' set to default","Set full-text search option 'load_os_resources' to @{defaultLoadOSResources}","DefaultRuleset, Configuration","The full-text search option 'load_os_resources' indicates whether operating system word breakers, stemmers, and filters are registered and used with this instance of SQL Server. By default, this property is disabled to prevent inadvertent behavior changes by updates made to the operating system. Enabling use of operating system resources provides access to resources for languages and document types registered with Microsoft Indexing Service that do not have an instance-specific resource installed. If you enable the loading of operating system resources, ensure that the operating system resources are trusted signed binaries; otherwise, they cannot be loaded when verify_signature (see below) is set to 1.",,"Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"FullTextServiceVerifySignature","definition","TRUE","Low","Full-text search option 'verify_signature' set to default","Set full-text search option 'load_os_resources' to @{defaultVerifySignature}","DefaultRuleset, Configuration, Security","The full-text search option 'verify_signature' indicates whether only signed binaries are loaded by the Full-Text Engine. By default, only trusted, signed binaries are loaded.",,"Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,
"FullTextSvcAccNotRecommended","definition","TRUE","Low","'Full-text search' service uses non-recommended account","Use another account to run 'Full-text search' service. Current account '@{attr::service::MSSQLFDLauncher.account}' is not recommended","DefaultRuleset, Configuration","Running the 'Full-text search' service under the 'NT AUTHORITY\SYSTEM' account is not recommended for security reasons.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions","Server","Windows",,"OnPremises","[11.0,)",,,
"FullTextSvcAccSame","definition","TRUE","Low","'Full-text search' and 'SQL Server Database Engine' use same account","Use different accounts for the 'Full-text search' service and the 'SQL Server Database Engine' service. Now both services use '@{attr::service::MSSQLFDLauncher.account}' account","DefaultRuleset, Configuration","Running the 'Full-text search' service under the same account as the 'SQL Server Database Engine' service is not recommended.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions","Server","Windows",,"OnPremises","[11.0,)",,,
"FullTextSvcStoped","definition","TRUE","Low","'Full-text search' service is stopped","Run 'Full-text search' service","DefaultRuleset, Configuration","The 'Full-text search' service quickly creates full-text indexes on content and properties of structured and semistructured data to provide document filtering and word-breaking for SQL Server.","https://docs.microsoft.com/sql/database-engine/configure-windows/manage-the-database-engine-services","Server","Windows",,"OnPremises","[11.0,)",,,
"HPLogicalProcessor","definition","TRUE","Low","HP Logical Processor issue","Update server BIOS to the latest version. It may be affected by the HP Logical Processor issue ","DefaultRuleset, Performance","HP ProLiant Gen9 servers configured with Intel Xeon E5 2600 v3 processors can be configured to support processor configurations that exceed 64 logical processors. Windows Operating Systems divide the logical processors into groups (Kgroups). On HP ProLiant Gen9 servers, the System Firmware, by default, reports the maximum number of possible logical processors to reflect the highest core count processor available. The result is that Windows Operating Systems will group the available logical processors into more than one Kgroup in a two-socket populated configuration. Applications that rely on older kernel APIs for affnitizing threads inside a process to a specific logical processor will only be able to address one Kgroup. The result is that the process will run on fewer logical processors than are presented to the OS for use. Workloads that utilize multiple processes (in lieu of a single process with multiple threads), or are leveraging the APIs that allow beyond single Kgroup addressing, will have full access to all the logical processors presented to the OS for use.","https://support.hpe.com/hpesc/public/docDisplay?docId=emr_na-c04650594","Server","Windows",,"OnPremises","[11.0,)",,,
"IndexCreateMemory","definition","TRUE","Low","'index create memory' should be greater than 'min memory per query'","Set 'index create memory' to 0 or make it greater than 'min memory per query'. Current 'index create memory' is @{index_create_memory} KB. Current 'min memory per query' is @{min_memory_per_query} KB","DefaultRuleset, Configuration, IndexCreateMemory","The 'index create memory' option controls the maximum amount of memory initially allocated for sort operations when creating indexes. The default value for this option is 0 (self-configuring). If more memory is later needed for index creation and the memory is available, the server will use it; thereby, exceeding the setting of this option. If additional memory is not available, the index creation will continue using the memory already allocated. However, if you experience difficulties creating indexes, consider increasing the value of this option from its run value.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-index-create-memory-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"LightweightPoolingOn","definition","TRUE","Low","Lightweight pooling option disabled","Disable 'lightweight pooling' option as fiber mode scheduling can decrease performance","DefaultRuleset, Configuration, Performance","The 'lightweight pooling' option is used to configure SQL Server to use simplified flows (or 'fibers'). Fiber mode is intended for certain situations in which the context switching of the UMS workers are the critical bottleneck in performance. Because this is rare, fiber mode rarely enhances performance or scalability on the typical system. Improved context switching in Microsoft Windows Server 2003 has also reduced the need for fiber mode. We do not recommend that you use fiber mode scheduling for routine operation. This is because it can decrease performance by inhibiting the regular benefits of context switching, and because some components of SQL Server that use Thread Local Storage (TLS) or thread-owned objects, such as mutexes (a type of Win32 kernel object), cannot function correctly in fiber mode.","https://docs.microsoft.com/sql/database-engine/configure-windows/lightweight-pooling-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"LocksOptionNotDefault","definition","TRUE","Low","Option 'locks' should be set to default","Set 'locks' option to @{recommended_max_lock_number}. Current value is @{locks}","DefaultRuleset, Configuration, Performance","The 'locks' option sets the maximum number of available locks, thereby limiting the amount of memory the SQL Server Database Engine uses for them. The default setting is 0, which allows the Database Engine to allocate and deallocate lock structures dynamically, based on changing system requirements.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-locks-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"MaxDOP1NUMA","definition","TRUE","Low","MAXDOP set in accordance with CPU count","Update MAXDOP option according to guideline (see help link). Current MAXDOP value is @{max_dop}, CPU count is @{online_logical_processors}","DefaultRuleset, MaxDOP, Performance, Configuration, NUMA, CPU","The Microsoft SQL Server max degree of parallelism (MAXDOP) configuration option controls the number of processors that are used for the execution of a query in a parallel plan. This option determines the number of threads that are used for the query plan operators that perform the work in parallel. Depending on whether SQL Server is set up on a symmetric multiprocessing (SMP) computer, a non-uniform memory access (NUMA) computer, or hyperthreading-enabled processors, the max degree of parallelism option should be configured appropriately.","https://support.microsoft.com/kb/2806535","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"MaxDopFewNumaLess16","definition","TRUE","Low","MAXDOP set in accordance with CPU count","Update MAXDOP configuration option value: @{max_dop}. It should not exceed the number of logical processors per NUMA node","DefaultRuleset, MaxDOP, Performance, Configuration, NUMA, CPU","The Microsoft SQL Server max degree of parallelism (MAXDOP) configuration option controls the number of processors that are used for the execution of a query in a parallel plan. This option determines the number of threads that are used for the query plan operators that perform the work in parallel. Depending on whether SQL Server is set up on a symmetric multiprocessing (SMP) computer, a non-uniform memory access (NUMA) computer, or hyperthreading-enabled processors, the max degree of parallelism option should be configured appropriately.","https://support.microsoft.com/kb/2806535","Server","Windows Linux",,"OnPremises","[13.0,)",,,
"MaxDopFewNumaOver16","definition","TRUE","Low","MAXDOP set in accordance to CPU count","Update MAXDOP configuration option value: @{max_dop}. It should be half the number of logical processors per NUMA node with maximum value of 16","DefaultRuleset, MaxDOP, Performance, Configuration, NUMA, CPU","The Microsoft SQL Server max degree of parallelism (MAXDOP) configuration option controls the number of processors that are used for the execution of a query in a parallel plan. This option determines the number of threads that are used for the query plan operators that perform the work in parallel. Depending on whether SQL Server is set up on a symmetric multiprocessing (SMP) computer, a non-uniform memory access (NUMA) computer, or hyperthreading-enabled processors, the max degree of parallelism option should be configured appropriately.","https://support.microsoft.com/kb/2806535","Server","Windows Linux",,"OnPremises","[13.0,)",,,
"MaxDopFewNumaOver8","definition","TRUE","Medium","MAXDOP set in accordance with CPU count","Update MAXDOP configuration option value: @{max_dop}. It should be equal to 8","DefaultRuleset, MaxDOP, Performance, Configuration, NUMA, CPU","The Microsoft SQL Server max degree of parallelism (MAXDOP) configuration option controls the number of processors that are used for the execution of a query in a parallel plan. This option determines the number of threads that are used for the query plan operators that perform the work in parallel. Depending on whether SQL Server is set up on a symmetric multiprocessing (SMP) computer, a non-uniform memory access (NUMA) computer, or hyperthreading-enabled processors, the max degree of parallelism option should be configured appropriately.","https://support.microsoft.com/kb/2806535","Server","Windows Linux",,"OnPremises","[11.0, 13.0)",,,
"MaxMemory","definition","TRUE","Low","Max allowed memory ","Set 'max server memory' value to @{recommended:N0} MB or less to avoid detrimental memory pressure. Current 'max server memory' value is @{max_server_memory:N0}, which is greater than recommended","DefaultRuleset, Memory, Performance, MaxMemory","Setting the 'max server memory' value too high can cause a single instance of SQL Server to compete for memory with other SQL Server instances hosted on the same machine. However, setting this value too low could cause significant memory pressure and performance problems.","https://docs.microsoft.com/sql/database-engine/configure-windows/server-memory-server-configuration-options","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,"2147483647"
"MaxMemory","override","TRUE","Warning",,,"",,,,,,"Express",,,,"1410"
"MaxMemory","override","TRUE","Warning",,,"",,,,,,"Standard",,,,"131072"
"MaxMemorySystem","definition","TRUE","Low","Max server memory exceeds system memory","Set 'max server memory' to @{recommended:N0} MB or less to avoid detrimental memory pressure. System memory of @{sysmem:N0} MB is not sufficient for current 'max server memory' setting of @{max_server_memory:N0} MB","DefaultRuleset, Memory, Performance, MaxMemory","Setting the 'max server memory' value higher than system memory can cause SQL Server to compete for memory with the operating system and processes running on the same machine.","https://docs.microsoft.com/sql/database-engine/configure-windows/server-memory-server-configuration-options","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,,"2147483647"
"MaxMemorySystem","override","TRUE","Warning",,,"",,,,,,"Express",,,,"1410"
"MaxMemorySystem","override","TRUE","Warning",,,"",,,,,,"Standard",,,,"131072"
"MinMemoryPerQuery","definition","TRUE","Low","Option 'min memory per query' set to default","Set 'min memory per query' option to @{recommended_min_memory_per_query} KB. Current value is '@{min_memory_per_query}'","DefaultRuleset, Configuration, Memory, Performance","The min memory per query option specifies the minimum amount of memory (in kilobytes) that will be allocated for the execution of a query. This is also known as the minimum memory grant. The default value is 1,024 KB. Do not set the min memory per query server configuration option too high, especially on very busy systems, because the query has to wait1 until it can secure the minimum memory requested, or until the value specified in the query wait server configuration option is exceeded. If more memory is available than the specified minimum value required to execute the query, the query is allowed to make use of the additional memory, provided that the memory can be used effectively by the query.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-min-memory-per-query-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"NetworkPacketSize","definition","TRUE","Low","Option 'network packet size' set to default","Set 'network packet size' option to @{recommended_network_packet_size} bytes. Current value is @{network_packet_size}","DefaultRuleset, Configuration, Network","The 'network packet size' option sets the packet size (in bytes) that is used across the whole network. Packets are the fixed-size chunks of data that transfer requests and results between clients and servers. The default packet size is 4096 bytes.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-network-packet-size-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"NtfsBlockSizeNotFormatted","definition","TRUE","Low","NTFS block size in volumes with database files <> 64KB","Set allocation unit size on volume '@{volume_mount_point}' to 64 KB. Current size is @{Output.BlockSize} bytes","DefaultRuleset, Performance, Configuration, NTFS","A drive can be formatted with different sizes ranging from 512 bytes to 64K sizes with the default being 4KB (4096 bytes). This setting is also called as “Bytes Per Cluster”. The atomic unit of storage in SQL Server is a page which is 8KB in size. Extents are groups of eight 8 KB pages that are physically contiguous to each other for a total of 64 KB. SQL Server uses extents to store data. Hence, on a SQL Server machine the NTFS Allocation unit size hosting SQL database files (Including tempdb files) should be 64 KB.","https://docs.microsoft.com/archive/blogs/docast/operating-system-best-practice-configurations-for-sql-server","Server","Windows",,"OnPremises","[11.0,)",,,
"NtfsBlockSizeNotFormatted","override","TRUE","Medium",,,"",,,,,"AzureSQL",,,,,
"OlapSvcAccSame","definition","TRUE","Low","'Analysis Services' and 'SQL Server Database Engine' use same account","Use different accounts for the 'Analysis Services' service and the 'SQL Server Database Engine' service. Now both services use '@{attr::service::MSOLAP.account}' account","DefaultRuleset, Configuration","Running the 'Analysis Services' service under the same account as the 'SQL Server Database Engine' service is not recommended.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions","Server","Windows",,"OnPremises","[11.0,)",,,
"OlapSvcStoped","definition","TRUE","Low","'Analysis Services' service is stopped","Run 'Analysis Services' service","DefaultRuleset, Configuration","The 'Analysis Services' service provides online analytical processing (OLAP) and data mining functionality for business intelligence applications.","https://docs.microsoft.com/sql/database-engine/configure-windows/manage-the-database-engine-services","Server","Windows",,"OnPremises","[11.0,)",,,
"OleAutomationProceduresOn","definition","TRUE","Low","Option 'Ole Automation Procedures' set to default","Disable 'Ole Automation Procedures' option to avoid security risks","DefaultRuleset, Configuration, Security","Use the 'Ole Automation Procedures' option to specify whether OLE Automation objects can be instantiated within Transact-SQL batches. When OLE Automation Procedures are enabled, a call to 'sp_OACreate' will start the OLE shared execution environment. The 'Ole Automation Procedures' option can be set to the following values: 1 Enabled, 0 Disabled (default value).","https://docs.microsoft.com/sql/database-engine/configure-windows/ole-automation-procedures-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"PageFileAutoManaged","definition","TRUE","Low","Page file is not automatically managed","Avoid automatic management of page files. Set custom size for page file on drives: '@{PagingFiles.Drive}'","DefaultRuleset, Performance, Memory, PageFile, SysAdminReq","Memory allocation failures can occur due to latencies that are associated with growing the size of a page file to support additional memory requirements in the system. A potential cause of these failures is when the page file size is configured as “automatic.” Automatic page-file size starts with a small page file and grows automatically as needed. The IO system consists of many components, including file system filters, file systems, volume filters, storage filters, and so on. The specific components on a given system can cause variability in page file growth.","https://support.microsoft.com/help/4055223/memory-allocation-errors-can-be-caused-by-slow-page-file-growth","Server","Windows","@{not=AzureSQL}","OnPremises","[11.0,)",,,
"PageFileAutoManagedAllDrives","definition","TRUE","Low","Page file is not automatically managed","Disable 'Automatically manage paging file size for all drives' option","DefaultRuleset, Performance, Memory, PageFile, SysAdminReq","Memory allocation failures can occur due to latencies that are associated with growing the size of a page file to support additional memory requirements in the system. A potential cause of these failures is when the page file size is configured as “automatic.” Automatic page-file size starts with a small page file and grows automatically as needed. The IO system consists of many components, including file system filters, file systems, volume filters, storage filters, and so on. The specific components on a given system can cause variability in page file growth. ","https://support.microsoft.com/help/4055223/memory-allocation-errors-can-be-caused-by-slow-page-file-growth","Server","Windows",,"OnPremises","[11.0,)",,,
"PageFileLess10FreeSpace","definition","TRUE","Low","Insufficient page file free space","Revise page file settings. Less than 10% of page file is available","DefaultRuleset, Performance, Memory, PageFile, SysAdminReq","Page file sizing depends on the system crash dump setting requirements and the peak usage or expected peak usage of the system commit charge. Both considerations are unique to each system, even for systems that are identical. This means that page file sizing is also unique to each system and cannot be generalized.","https://docs.microsoft.com/windows/client-management/determine-appropriate-page-file-size","Server","Windows Linux",,"OnPremises","[11.0,)",,"0.1",
"PageFileNotConfigured","definition","TRUE","Low","Page file not configured","Create page file on server","DefaultRuleset, Performance, Memory, PageFile, SysAdminReq","Page file sizing depends on the system crash dump setting requirements and the peak usage or expected peak usage of the system commit charge. Both considerations are unique to each system, even for systems that are identical. This means that page file sizing is also unique to each system and cannot be generalized.","https://docs.microsoft.com/windows/client-management/determine-appropriate-page-file-size","Server","Windows",,"OnPremises","[11.0,)",,,
"PageFileOut","definition","TRUE","Low","Memory paged out","Revise LPIM settings. Part of SQL Server process memory has been paged out","DefaultRuleset, Performance, Memory, PageFile, SysAdminReq","Microsoft SQL Server performs dynamic memory management based on the memory requirements of the current load and activities on the system. On Windows, SQL Server can use the memory notification mechanisms that are provided by the QueryMemoryResourceNotification Windows API. Based on this information from the QueryMemoryResourceNotification Windows API or from the memory calculation, SQL Server responds to the current memory situation on a specific system. This provides the following benefits: 1. The system does not page out the working set of the SQL Server process; 2. The necessary database pages are available in memory to reduce physical I/O needs. For more information, see the ""Dynamic memory management"" topic and the ""Server memory options"" topic in SQL Server Books Online.","https://docs.microsoft.com/sql/database-engine/configure-windows/enable-the-lock-pages-in-memory-option-windows","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"PowerPlanSchemeNotRecommended","definition","TRUE","Medium","Power plan is High Performance","Switch server to High Performance power plan","DefaultRuleset, Configuration, Performance","In some cases you may experience degraded overall performance on a Windows Server 2008 R2 or later machine when running with the default (Balanced) power plan. The issue may occur irrespective of platform and may be exhibited on both native and virtual environments. The degraded performance may increase the average response time for some tasks and cause performance issues with CPU-intensive applications. Please note that you may not notice performance issues while performing simple operations. However, applications or scripts that intensively use resources (primarily processor and memory) may exhibit the problem. To work around the performance degradation issue, you can switch to the High Performance power plan. However, this will disable dynamic performance scaling on the platform. Depending on the environment, if the platform is always under a heavy load, then this is a viable solution.","https://support.microsoft.com/help/2207548/slow-performance-on-windows-server-when-using-the-balanced-power-plan","Server","Windows",,"OnPremises","[11.0,)",,,
"PriorityBoostOn","definition","TRUE","High","Option 'priority boost' set to default","Set 'priority boost' option to default value","DefaultRuleset, Configuration, Performance","The 'priority boost' option used to specify whether Microsoft SQL Server should run at a higher scheduling priority than other processes on the same computer. If this option is set to 1, SQL Server runs at a priority base of '13' scheduler. The default is '0', which is a priority base of '7'.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-priority-boost-server-configuration-option","Server","Windows",,"OnPremises","[11.0,)",,,
"QueryWaitNotDefault","definition","TRUE","High","Option 'query wait' set to default","Set 'query wait' option to @{default_query_wait}. Current value is @{query_wait}. Increasing maximum wait time may increase amount of time to terminate queries","DefaultRuleset, Configuration","Memory-intensive queries (such as those involving sorting and hashing) are queued when there is not enough memory available to run the query. The query wait option specifies the time, in seconds (from 0 through 2147483647), that a query waits for resources before it times out. The default value for this option is -1. This means the time-out is calculated as 25 times the estimated query cost.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-query-wait-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"RecoveryIntervalOn","definition","TRUE","Low","Option 'recovery interval' set to default","Set 'recovery interval' option to @{default_recovery_interval}. Current value is @{recovery_interval}","DefaultRuleset, Configuration, Performance","The 'recovery interval' option defines an upper limit on the time recovering a database should take. The default recovery-interval value is 0, which allows the Database Engine to automatically configure the recovery interval. Higher values indicate the approximate maximum recovery time, in minutes.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-recovery-interval-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"RemoteDacClusterOn","definition","TRUE","Low","Remote admin connections enabled on cluster (DAC)","Enable 'remote admin connections' option","DefaultRuleset, Configuration","SQL Server provides a dedicated administrator connection (DAC). The DAC lets an administrator access a running server to execute diagnostic functions or Transact-SQL statements, or to troubleshoot problems on the server, even when the server is locked or running in an abnormal state and not responding to a SQL Server Database Engine connection. On cluster configurations, the DAC will be off by default. Users can execute the remote admin connection option of sp_configure to enable the DAC listener to access a remote connection. If SQL Server is unresponsive and the DAC listener is not enabled, you might have to restart SQL Server to connect with the DAC. Therefore, we recommend that you enable the remote admin connections configuration option on clustered systems.","https://docs.microsoft.com/sql/database-engine/configure-windows/diagnostic-connection-for-database-administrators","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"RemoteQueryTimeout","definition","TRUE","Low","Option 'remote query timeout' set to default","Set 'remote query timeout' option to @{recommended_remote_query_timeout}. Current value is @{remote_query_timeout}","DefaultRuleset, Configuration","The 'remote query timeout' option specifies how long, in seconds, a remote operation can take before SQL Server times out. The default value for this option is 600, which allows a 10-minute wait. This value applies to an outgoing connection initiated by the Database Engine as a remote query.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-remote-query-timeout-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"RsSvcAccSame","definition","TRUE","Low","'Reporting Services' and 'SQL Server Database Engine' use same account","Use different accounts for 'Reporting Services' service and the 'SQL Server Database Engine' service. Now both services use '@{attr::service::ReportServer.account}' account","DefaultRuleset, Configuration","Running the 'Reporting Services' service under the same account as the 'SQL Server Database Engine' service is not recommended.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions","Server","Windows",,"OnPremises","[11.0,)",,,
"RsSvcStoped","definition","TRUE","Low","'Reporting Services' service is stopped","Run 'Reporting Services' service","DefaultRuleset, Configuration","'The Reporting Services' service manages, executes, creates, schedules and delivers reports.","https://docs.microsoft.com/sql/database-engine/configure-windows/manage-the-database-engine-services","Server","Windows",,"OnPremises","[11.0,)",,,
"ScanStartupProcs","definition","TRUE","Low","Option 'scan for startup procs' disabled on replication servers","Disable 'scan for startup procs' option for servers that participate in replication","DefaultRuleset, Configuration","Use the scan for startup procs option to scan for automatic execution of stored procedures at SQL Server startup time. If this option is set to 1, SQL Server scans for and runs all automatically run stored procedures that are defined on the server. The default value for scan for startup procs is 0 (do not scan). This option shouldn't be enabled on a SQL Server participating in replication.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-scan-for-startup-procs-server-configuration-option","Server","Windows",,"OnPremises","[11.0,)",,,
"SqlSvcAccNotRecommended","definition","TRUE","Low","'SQL Server Database Engine' service uses non-recommended account","Use another account to run 'SQL Server Database Engine' service. Current account '@{attr::service::MSSQL.account}' is not recommended","DefaultRuleset, Configuration","Running the 'SQL Server Database Engine' service under 'NT AUTHORITY\SYSTEM' or 'NT AUTHORITY\NETWORKSERVICE' accounts is not recommended for security reasons.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions","Server","Windows",,"OnPremises","[11.0,)",,,
"SqlSvcAccNotSupported","definition","TRUE","Low","'SQL Server Database Engine' service uses not supported account","Use another account to run 'SQL Server Database Engine' service. Current account '@{attr::service::MSSQL.account}' is not supported","DefaultRuleset, Configuration","Running the 'SQL Server Database Engine' service under 'NT AUTHORITY\LOCALSERVICE', 'NT AUTHORITY\SYSTEM' or 'NT AUTHORITY\NETWORKSERVICE' accounts is not supported.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-windows-service-accounts-and-permissions","Server","Windows",,"OnPremises","[11.0,)",,,
"ThreadExhaustionCPUBound","definition","TRUE","Low","Worker thread exhaustion on CPU-bound system","Possible worker thread exhaustion (schedulers work queue count is '@{schedulers_work_queue_count}'). Overall runnable tasks count is '@{overall_runnable_tasks_count}' (> 2), indicating the server might be CPU-bound. Configured workers is '@{max_workers_count}'","DefaultRuleset, Performance","Consider overall runnable tasks count and schedulers work queue count.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-max-worker-threads-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"ThreadExhaustionNotCPUBound","definition","TRUE","Low","Possible worker thread exhaustion on non-CPU-bound system","Possible worker thread exhaustion (schedulers work queue count is '@{schedulers_work_queue_count}'). Because overall runnable tasks count is '@{overall_runnable_tasks_count}' (<= 2), indicating the server might not be CPU bound, there might be room to increase max_worker_threads (configured workers is '@{max_workers_count}')","DefaultRuleset, Performance","Consider overall runnable tasks count and schedulers work queue count.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-max-worker-threads-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"ThresholdForParallelism","definition","TRUE","Medium","Option 'cost threshold for parallelism' set to default","Set 'cost threshold for parallelism' option to @{default_cost_parallel}. Current value is @{cost_threshold_for_parallelism}","DefaultRuleset, Configuration, Performance","The 'cost threshold for parallelism' option specifies the threshold at which SQL Server creates and runs parallel plans for queries. SQL Server creates and runs a parallel plan for a query only when the estimated cost to run a serial plan for the same query is higher than the value set in the cost threshold for parallelism. The cost refers to an estimated cost required to run the serial plan on a specific hardware configuration and is not a unit of time. The 'cost threshold for parallelism' option can be set to any value from 0 through 32767. The default value is 5.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-cost-threshold-for-parallelism-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"WorkerThreadsLargeX64","definition","TRUE","Low","Option 'max worker threads' set to recommended value on x64 system","Reconfigure 'max worker threads' option parameter. Current value (@{max_worker_threads}) is higher than recommended for x64 system (@{recommended_max_worker_threads})","DefaultRuleset, Configuration, Performance, CPU","The max worker threads option configures the number of worker threads that are available to SQL Server processes. The default value for max worker threads is 0. This enables SQL Server to automatically configure the number of worker threads at startup.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-max-worker-threads-server-configuration-option","Server","Windows",,"OnPremises","[11.0,)",,,
"WorkerThreadsLargeX86","definition","TRUE","Low","Option 'max worker threads' set to recommended value on x86 system","Reconfigure 'max worker threads' option. Current value (@{max_worker_threads}) is higher than recommended for x86 system (@{recommended_max_worker_threads})","DefaultRuleset, Configuration, Performance, CPU","The max worker threads option configures the number of worker threads that are available to SQL Server processes. The default value for max worker threads is 0. This enables SQL Server to automatically configure the number of worker threads at startup.","https://docs.microsoft.com/sql/database-engine/configure-windows/configure-the-max-worker-threads-server-configuration-option","Server","Windows",,"OnPremises","[11.0,)",,,
"XpCmdShellOn","definition","TRUE","Low","Option 'xp_cmdshell' is disabled","Disable 'xp_cmdshell' as it exposes to security risks","DefaultRuleset, Configuration","The xp_cmdshell option is a SQL Server configuration option that enables system administrators to control whether the xp_cmdshell extended stored procedure can be executed on a system. By default, the xp_cmdshell option is disabled on new installations. ","https://docs.microsoft.com/sql/database-engine/configure-windows/xp-cmdshell-server-configuration-option","Server","Windows Linux",,"OnPremises","[11.0,)",,,
"AzDataDiskCache","definition","TRUE","High","Azure disk caching for data files","Set caching to 'ReadOnly' for disk @{name} (@{volume_mount_point}) as it is used for storing data files. Current setting: '@{caching}'","DefaultRuleset, Performance, DBFileConfiguration, DBConfiguration","Uncached IOPS and throughput plus Cached IOPS and throughput will yield the total possible performance available from the virtual machine within the VMs limits.","https://docs.microsoft.com/azure/azure-sql/virtual-machines/windows/performance-guidelines-best-practices-storage#data-file-caching-policies","Database","Windows","AzureSQL","OnPremises","[11.0,)","NOT: tempdb",,
"AzDataOnDataDisks","definition","TRUE","Medium","Data files on Azure data disks","Move data files from @{volume_mount_point} to Premium SSD data disk(s)","DefaultRuleset, DBFileConfiguration, DBConfiguration","Azure data disks can be configured for optimal data security and performance. ","https://docs.microsoft.com/azure/azure-sql/virtual-machines/windows/performance-guidelines-best-practices-checklist","Database","Windows","AzureSQL","OnPremises","[11.0,)","NOT: tempdb",,
"AzDataOnDataDisks","override","TRUE","Low",,,"",,,,,,,,"master model msdb",,
"AzDbDefaultLocation","definition","TRUE","Medium","Database default locations","Configure default @{setting_name} file location","DefaultRuleset, Configuration, Performance","Default database file location setting makes new data and transaction log files placed on drives configured for this specific workload.","https://docs.microsoft.com/azure/azure-sql/virtual-machines/windows/performance-guidelines-best-practices-checklist","Server","Windows","AzureSQL","OnPremises","[11.0,)",,,
"AzDiskColumnCount","definition","TRUE","Medium","Storage spaces disk column count","Use all @{poolDiskCount} physical disks of storage pool for virtual disk (@{volume_mount_point}). @{columnCount} physical disk(s) are used now.","DefaultRuleset, DBFileConfiguration, DBConfiguration, Performance","Increasing virtual disk column count improves the disk's performance. The number of disks in the pool is the maximum available number of columns.","https://docs.microsoft.com/azure/azure-sql/virtual-machines/windows/performance-guidelines-best-practices-checklist","Server","Windows",,"OnPremises","[11.0,)",,,
"AzErrorLogLocation","definition","TRUE","Medium","Error log and default trace files on Azure data disk","Move error log and default trace files to data disk","DefaultRuleset, Configuration, Performance","Storing error log and default trace files on data disk improves performance.","https://docs.microsoft.com/azure/azure-sql/virtual-machines/windows/performance-guidelines-best-practices-checklist","Server","Windows","AzureSQL","OnPremises","[11.0,)",,,
"AzPremSsdDataFiles","definition","TRUE","High","Use premium SSDs for SQL Server data files","Move data files from @{volume_mount_point} to Premium SSD disk","DefaultRuleset, Performance, DBFileConfiguration, DBConfiguration","Standard HDDs and SSDs have varying latencies and bandwidth and are only recommended for dev/test workloads. Production workloads should use premium SSDs.","https://docs.microsoft.com/azure/azure-sql/virtual-machines/windows/performance-guidelines-best-practices-storage","Database","Windows","AzureSQL","OnPremises","[11.0,)","NOT: tempDb",,
"AzPremSsdDataFiles","override","TRUE","Low",,,"",,,,,,,,"master model msdb",,
"AzTempDbFileLocation","definition","TRUE","High","Tempdb files on Azure temp drive","Move tempdb files from @{volume_mount_point} to the local ephemeral SSD (temp disk)","DefaultRuleset, Performance, DBFileConfiguration, DBConfiguration","Storing tempdb files on a local ephemeral SSD improves the performance of workloads that use temporary objects heavily (e.g. queries handling large recordsets, index rebuilds, row versioning isolation levels, temp tables, and triggers).","https://docs.microsoft.com/azure/azure-sql/virtual-machines/windows/performance-guidelines-best-practices-checklist","Database","Windows","AzureSQL","OnPremises","[11.0,)","tempdb",,
"AzTranLogDiskCache","definition","TRUE","High","Azure disk caching for transaction logs","Set caching to 'None' for disk @{name} (@{volume_mount_point}) as it is used for storing transaction log files. Current setting: '@{caching}'","DefaultRuleset, Performance, DBFileConfiguration, DBConfiguration","There is no performance benefit to enabling caching for the Transaction log disk, and in fact having either Read-only or Read/Write caching enabled on the log drive can decrease the amount of cache available for reads on the data drive","https://docs.microsoft.com/azure/azure-sql/virtual-machines/windows/performance-guidelines-best-practices-storage#data-file-caching-policies","Database","Windows","AzureSQL","OnPremises","[11.0,)","NOT: tempdb",,
"InstantFileInitialization","definition","TRUE","High","Instant file initialization (IFI) is disabled","Enable instant file initialization","DefaultRuleset, DBConfiguration, Performance","Instant file initialization (IFI) allows for faster execution of the previously mentioned file operations, since it reclaims used disk space without filling that space with zeros. Instead, disk content is overwritten as new data is written to the files.","https://docs.microsoft.com/en-us/sql/relational-databases/databases/database-instant-file-initialization","Server","Windows",,"OnPremises","[11.0.7001,12.0) [12.0.5000, )",,,
"LockedPagesInMemory","definition","TRUE","High","Lock pages in memory","Enable the 'Lock pages in memory' option","DefaultRuleset, Performance, Memory","This Windows policy determines which accounts can use a process to keep data in physical memory, preventing the system from paging the data to virtual memory on disk.","https://docs.microsoft.com/azure/azure-sql/virtual-machines/windows/performance-guidelines-best-practices-checklist","Server","Windows","AzureSQL","OnPremises","[11.0,)",,,
"LockedPagesInMemory","override","TRUE","Warning",,,"",,,,,,,"[11.0.7001, 12.0) [12.0.6024, 13.0) [13.0.4001,)",,,
"PlansUseRatioNotOptimal","definition","TRUE","Information","Cache needs to be cleared of single-use plans","Check if the plan cache needs to be cleared. Current amount of single-use plans in cache is high (@{SingleUsePlansUseRatio:P0})","DefaultRuleset, Performance, QueryOptimizer","Setting the 'Optimize for ad hoc workloads' option to 1 affects only new plans; plans that are already in the plan cache are unaffected. Make sure to check whether you need to clear the cache from the old single-use plans that may continue to remain.","https://docs.microsoft.com/sql/database-engine/configure-windows/optimize-for-ad-hoc-workloads-server-configuration-option","Server","Windows Linux",,"OnPremises, ManagedInstance","[11.0,)",,"0.5",
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