sql-server-samples/samples/manage/sql-assessment-api/DefaultRuleset.csv

1	id	level	displayName	message	tags	description	helpLink	probes	target.type	target.platform	target.engineEdition	target.version	target.name.not	threshold
2	AutoCreateStats	Warning	Auto-Create Statistics should be on	Turn Auto-Create Statistics option on 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 If the statistics become out of date and significant changes have occurred against the underlying data, this can result in less than optimal query performance.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	['DatabaseConfiguration']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
3	AutoUpdateStats	Warning	Auto-Update Statistics should be on	Turn Auto-Update Statistics option on 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 If the statistics become out of date and significant changes have occurred against the underlying data, this can result in less than optimal query performance.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Statistics setting is ON, the Query Optimizer updates statistics when they are used by a query and when they might be out-of-date. Statistics become out-of-date after insert, update, delete, or merge operations change the data distribution in the table or indexed view. The Query Optimizer determines when statistics might be out-of-date by counting the number of data modifications since the last statistics update and comparing the number of modifications to a threshold.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	['DatabaseConfiguration']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
4	QueryStoreOn	Warning	Query Store should be active	Make sure Query Store actual operation mode is 'Read Write' to keep your 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	['DatabaseConfiguration']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[13.0,)	/^(master|tempdb|model)$/
5	TF174	Information	TF 174 increases the plan cache bucket count	Consider enabling trace flag 174 to increase the 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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	['[11.0.3368,12.0)', '[12.0.2480,13.0)', '[13.0,)']
6	TF634	Information	TF 634 disables background columnstore compression	Trace Flag 634 disables the background columnstore compression task. Verify need to set a non-default trace flag with the current system build and configuration.	['DefaultRuleset', 'TraceFlag', 'Memory', 'Performance', 'ColumnStore']	Trace Flag 634 disables the background columnstore compression task. SQL Server periodically runs the Tuple Mover background task that compresses columnstore index rowgroups with uncompressed data, one such rowgroup at a time. Columnstore compression improves query performance but also consumes system resources. You can control the timing of columnstore compression manually, by disabling the background compression task with trace flag 634, and then explicitly invoking ALTER INDEX...REORGANIZE or ALTER INDEX...REBUILD at the time of your choice.	https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
7	TF652	Information	TF 652 disables page pre-fetching scans	Trace Flag 652 disables Page Pre-fetching Scans. Verify need to set a non-default trace flag with the 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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
8	TF661	Information	TF 661 disables Ghost Cleanup Task	Trace flag 661 disables the background ghost cleanup task. Verify need to set a non-default trace flag with the 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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
9	TF834	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/help/4465518	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
10	TF845	Warning	TF 845 is not needed in SQL Server 2012 and higher versions	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. Consider enabling TF 834 if you have a server that has a lot of memory, particularly for an analytical or data warehousing workload. 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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
11	TF902	Warning	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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
12	TF1117	Information	TF 1117 Enables Filegroup-level Autogrow	Consider enabling trace flag 1117 to enable filegroup autogrow.	['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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
13	TF1118	Information	TF 1118 Disables Single Page Allocations	Consider enabling 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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
14	TF1204	Information	TF 1204 returns deadlock information	Trace Flag 1204 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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
15	TF1211	Warning	TF 1211: Lock Escalation should be enabled	Disable trace flag 1211 to allow 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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
16	TF1222	Information	TF 1222 returns deadlock information	Trace Flag 1222 returns deadlock information.	['DefaultRuleset', 'TraceFlag', 'Locks', 'Performance']	Trace Flag 1222 returns the resources and types of locks that are participating in a deadlock, including the affected command. The resulting information is recorded in the SQL Server Errorlog, in XML format that does not comply with any XSD schema.	https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
17	TF1224	Warning	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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
18	TF1229	Warning	TF 1229: Lock Partitioning should be enabled	Disable trace flag 1229 to allow lock partitioning.	['DefaultRuleset', 'TraceFlag', 'Locks', 'Performance', 'CPU']	Trace Flag 1229 disables lock partitioning regardless of the number of CPUs. By default, SQL Server enables lock partitioning when a server has 16 or more CPUs, to improve the scalability characteristics of larger systems. Disabling lock partitioning may cause can cause spinlock contention and poor performance, or unexpected behaviors when switching partitions.	https://docs.microsoft.com/sql/relational-databases/sql-server-transaction-locking-and-row-versioning-guide	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
19	TF1236	Warning	TF 1236: Database Lock Partitioning should be enabled	Enable trace Flag 1236 to allow 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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
20	TF1462	Warning	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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
21	TF2312	Warning	TF 2312 sets the default Cardinality Estimation model	Trace Flag 2312 does not apply to this SQL Server version. Verify need to set a non-default trace flag with the current system build and configuration.	['DefaultRuleset', 'TraceFlag', 'QueryOptimizer', 'Performance']	Trace Flag 2312 sets the Query Optimizer cardinality estimation model to the default version of the database compability level of SQL Server 2014 and higher versions. If the database compatibility level is lower than 120, enabling trace flag 2312 uses the cardinality estimation model of SQL Server 2014 (120).	https://support.microsoft.com/help/2801413	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
22	TF2330	Warning	TF 2330 disables recording of index usage stats	Trace Flag 2330 does not apply to this SQL Server version. Verify need to set a non-default trace flag with the current system build and configuration.	['DefaultRuleset', 'TraceFlag', 'Performance', 'Indexes']	Trace Flag 2330 disables recording of index usage stats, which could lead to a non-yielding condition in SQL 2005.	https://blogs.msdn.microsoft.com/ialonso/2012/10/08/faq-around-sys-dm_db_index_usage_stats	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
23	TF2340	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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
24	TF2371	Information	TF 2371 enables a linear recompilation threshold for statistics	Enable trace Flag 2371 to allow a linear recompilation threshold for statistics.	['DefaultRuleset', 'TraceFlag', 'Performance', 'Statistics']	Trace Flag 2371 causes SQL Server to change the fixed update statistics threshold to a linear update statistics threshold. This is especially useful to keep statistics updated on large tables.	https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
25	TF2389	Information	TF 2389 enables automatic statistics for Ascending Keys	Trace Flag 2389 enables automatic statistics for ascending keys. Verify need to set a non-default trace flag with the current system build and configuration.	['DefaultRuleset', 'TraceFlag', 'Statistics', 'Performance']	Trace Flag 2389 enables automatically generated quick statistics for ascending keys (histogram amendment). This trace flag is recommended to be set in cases where queries access newly inserted ascending key values (such as an IDENTITY column), but the new values are not yet updated in the statistics histogram for the affected columns. In this case the histogram used to estimate cardinality will be adjusted at query compile time. Verify need to set a non-default trace flag with the current system build and configuration.	https://support.microsoft.com/help/2801413	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
26	TF2390	Information	TF 2390 enables automatic statistics for Ascending or Unknown Keys	Trace Flag 2390 enables automatic statistics for ascending or unknown keys. Verify need to set a non-default trace flag with the 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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
27	TF2528	Warning	TF 2528 disables parallel operations for integrity checking	Trace Flag 2528 disables parallel operations for integrity checking.	['DefaultRuleset', 'TraceFlag', 'DataIntegrity', 'DBCC']	Trace Flag 2528 disables parallel checking of objects by DBCC CHECKDB, DBCC CHECKFILEGROUP, and DBCC CHECKTABLE. By default, the degree of parallelism is automatically determined by the query processor. The maximum degree of parallelism is configured just like that of parallel queries. When parallel checks are disabled, the DBCC commands will take longer to complete. Starting with SQL Server 2014 SP2, a MAXDOP option is available to override the max degree of parallelism configuration option of sp_configure for the DBCC statements.	https://docs.microsoft.com/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
28	TF2549	Warning	TF 2549 optimizes PHYSICAL_ONLY option of DBCC CHECKDB	Trace Flag 2549 forces DBCC CHECKDB to treat different physical files as one logical file.	['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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
29	TF2562	Warning	TF 2562 forces the DBCC CHECKDB command to execute in a single batch	Trace Flag 2562 forces the DBCC CHECKDB command to execute in a single batch.	['DefaultRuleset', 'TraceFlag', 'DBCC', 'TempDB']	Trace Flag 2562 forces the DBCC CHECKDB command to execute in a single batch regardless of the number of indexes in the database. This trace flag can improve the performance when using the PHYSICAL_ONLY option, but space requirements for TempDB may increase.	https://support.microsoft.com/help/2634571	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
30	TF2566	Warning	TF 2566 disables default data purity check	Trace Flag 2566 disables 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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
31	TF3023	Information	TF 3023 enables Backup Checksum option by default	Trace Flag 3023 enables CHECKSUM option as default for BACKUP command.	['DefaultRuleset', 'TraceFlag', 'Backup']	Trace Flag 3023 enables the CHECKSUM option of the BACKUP command by default. This trace flag forces the CHECKSUM option for BACKUP command even when not explicitely set. Starting with SQL Server 2014, this behavior is controlled by setting the Backup Checksum Default configuration option.	https://support.microsoft.com/help/2656988	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
32	TF3042	Information	TF 3042 bypasses the default backup compression pre-allocation algorithm	Trace Flag 3042 enables the bypass of the default backup compression.	['DefaultRuleset', 'TraceFlag', 'Backup']	Trace Flag 3042 bypasses the default backup compression pre-allocation algorithm to allow the backup file to grow only as needed to reach its final size. This trace flag can achieve space savings by allocating only the actual size required for the compressed backup, but might increase the overall backup operation time.	https://docs.microsoft.com/sql/relational-databases/backup-restore/backup-compression-sql-server	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
33	TF3226	Information	TF 3226 disables ErrorLog entries for every successful backup operation	Trace Flag 3226 disables ErrorLog entries for every 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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
34	TF4136	Warning	TF 4136 disables Parameter Sniffing	Trace Flag 4136 does not apply to this SQL Server version. Verify need to set a non-default trace flag with the current system build and configuration.	['DefaultRuleset', 'TraceFlag']	Trace Flag 4136 disables parameter sniffing unless OPTION(RECOMPILE), WITH RECOMPILE or OPTIMIZE FOR value is used, but does not apply to this SQL Server version. Starting with SQL Server 2016, to accomplish this at the database level use the PARAMETER_SNIFFING option in ALTER DATABASE SCOPED CONFIGURATION. Verify need to set a non-default trace flag with the current system build and configuration.	https://support.microsoft.com/help/980653	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
35	TF4137	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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
36	TF4138	Warning	TF 4138 causes plans to not use Row Goal adjustments	Trace flag 4138 does not apply to this SQL Server version. Verify need to set a non-default trace flag with the current system build and configuration.	['DefaultRuleset', 'TraceFlag', 'QueryOptimizer', 'Performance']	Trace Flag 4138 causes SQL Server to generate a plan that does not use row goal adjustments with queries that contain TOP, OPTION (FAST N), IN, or EXISTS keywords. Starting with SQL Server 2016 SP1, to accomplish this at the query level use the USE HINT 'DISABLE_OPTIMIZER_ROWGOAL' query hint. However it does not apply to this SQL Server version. Verify need to set a Non-default trace flag with current system build and configuration.	https://support.microsoft.com/help/2667211	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
37	TF4139	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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
38	TF4199	Information	TF 4199 enables Query Optimizer fixes	Trace Flag 4199 enables Query Optimizer fixes. Verify need to set a non-default trace flag with the current system build and configuration.	['DefaultRuleset', 'TraceFlag', 'QueryOptimizer']	Trace Flag 4199 enables Query Optimizer fixes released in SQL Server Cumulative Updates and Service Packs.	http://support.microsoft.com/help/974006	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[11.0, 14.0)
39	TF6498	Warning	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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
40	TF6532	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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	['[11.0.6020,11.0.6518)']
41	TF6532.6533	Warning	TF 6532 and TF 6533 enable performance improvements for Spatial data	Trace flags 6532 and 6533 do 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']	Trace flags 6532 and 6533 enable performance improvements of query operations with spatial data types. However, this trace flag does not apply to this SQL Server version. Starting with SQL Server 2016, this behavior is controlled by the engine and trace flags 6532 and 6533 have no effect.	https://support.microsoft.com/help/3107399	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
42	TF6534	Warning	TF 6534 enables performance improvements for Spatial data	Trace flag 6534 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']	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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
43	TF7412	Information	TF 7412 enables the lightweight profiling infrastructure for query troubleshooting	Enable trace flag 7412 to enables the 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	['EnabledGlobalTraceFlags']	Server	/^(Windows|Linux)$/	OnPremises	[13.0.4001,15.0)
44	TF9024	Warning	TF 9024 converts a global log pool memory object into NUMA node memory object	Verify need to set a Non-default TF with current system build and configuration.	['DefaultRuleset', 'TraceFlag', 'Performance', 'NUMA', 'Memory', 'CPU']	TF9024 converts a global log pool memory object into NUMA node partitioned memory object.	https://support.microsoft.com/help/2809338/fix-high-log-write-waits-counter-value-on-a-sql-server-2012-or-sql-ser	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises
45	TF8048	Warning	TF 8048 converts NUMA partitioned memory objects into CPU partitioned	Verify need to set a Non-default TF with current system build and configuration.	['DefaultRuleset', 'TraceFlag', 'Performance', 'NUMA', 'CPU', 'Memory']	TF 8048 converts NUMA partitioned memory objects into CPU partitioned.	https://support.microsoft.com/help/2809338/fix-high-log-write-waits-counter-value-on-a-sql-server-2012-or-sql-ser	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises
46	DeprecatedFeatures	Warning	Deprecated or discontinued features should not be used	Detected deprecated or discontinued feature uses: @{DeprecatedFeature}. We recommend to replace them with features actual for SQL Server version @{ProductVersion}.	['DefaultRuleset', 'Deprecated', 'Security', 'UpdateIssues', 'Performance']	This check detects deprecated or discontinued features used on target SQL Server instance. Deprecated features may be removed in a future release of SQL Server. Discontinued features have been removed from specific versions of SQL Server.	https://docs.microsoft.com/sql/relational-databases/performance-monitor/sql-server-deprecated-features-object	['DeprecatedFeaturesStats', 'SQLServerVersion']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|tempdb|model|msdb)$/
47	SystemHealthSession	Warning	system_health XEvent session is not active	Start the session by using the ALTER EVENT SESSION statement or by using the Extended Events node in Object Explorer.	['DefaultRuleset', 'XEvent', 'SystemHealth']	This session starts automatically when the SQL Server Database Engine starts, and runs without any noticeable performance effects. The session collects system data that you can use to help troubleshoot performance issues in the Database Engine. We recommend that you do not stop, alter, or delete the system health session.	https://docs.microsoft.com/sql/relational-databases/extended-events/use-the-system-health-session	['XEvent.SystemHealth']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
48	SPServerDiagnosticsSession	Warning	sp_server_diagnostics xEvent session is not active	Start the session by using the ALTER EVENT SESSION statement or by using the 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	['XEvent.SPServerDiagnostics']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
49	BlackboxTrace	Warning	Blackbox trace is configured and running	Make sure you still need the blackbox trace and stop it otherwise.	['DefaultRuleset', 'Traces']	This trace is designed to behave similarly to an airplane black box, to help you diagnose intermittent server crashes. It consumes more resources than the default trace and should not be running for extended periods of time.	https://docs.microsoft.com/sql/relational-databases/system-stored-procedures/sp-trace-create-transact-sql	['CountBlackBoxTraces']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
50	DefaultTrace	Warning	No default trace was found or is not active	Make sure that there is enough space for SQL Server to write the default trace file. Then have the default trace run by disabling and re-enabling 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	['CountDefaultTraces']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
51	HintsStatistics	Information	Hints are being used	We recommend that <join_hint>, <query_hint>, and <table_hint> be used only as a last resort by experienced developers and database administrators, because the SQL Server Query Optimizer typically selects the best execution plan for a query.	['DefaultRuleset', 'QueryOptimizer', 'Performance', 'Statistics']	Hints are options or strategies specified for enforcement by the SQL Server query processor on SELECT, INSERT, UPDATE, or DELETE statements. The hints override any execution plan the Query Optimizer might select for a query. Because the SQL Server Query Optimizer typically selects the best execution plan for a query, we recommend that <join_hint>, <query_hint>, and <table_hint> be used only as a last resort by experienced developers and database administrators.	https://docs.microsoft.com/sql/t-sql/queries/hints-transact-sql	['Hints.InstanceStatistics']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
52	HintsUsageInModules	Information	Hints usage in modules	@{Hint} was 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	['Hints.ModuleUsage']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
53	PlansUseRatio	Warning	Amount of single use plans in cache is high	Amount of single use plans in cache is high (@{SingleUsePlansUseRatio:P0}). Consider enabling the Optimize for ad hoc workloads setting on heavy OLTP ad-hoc workloads to conserve resources.	['DefaultRuleset', 'Performance', 'QueryOptimizer']	Single use plans waste system resources.	https://docs.microsoft.com/sql/database-engine/configure-windows/optimize-for-ad-hoc-workloads-server-configuration-option	['CachedPlans.SingleUseRatio']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
54	HypotheticalIndexes	Warning	Hypothetical indexes found	Index @{IndexName} for @{Schema}.@{Object} is marked as hypothetical. It is recommended to drop hypothetical index @{IndexName} as soon as possible.	['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	['Hypothetical.Indexes']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|model|msdb|tempdb)$/
55	HypotheticalStatistics	Warning	Hypothetical statistics found	Statistics @{StatName} for @{Schema}.@{Object} is hypothetical. It is recommended to drop hypothetical statistics @{StatName} as soon as possible.	['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	['Hypothetical.Statistics']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
56	LatestCU	Warning	SQL Server instance is not up to date	Product version @{ProductVersion} is not the latest available. We recommend keeping your SQL Server up to date and install Service Packs and Cumulative Updates as they are released.	['DefaultRuleset', 'Security', 'UpdateIssues']	On an installed instance of SQL Server, we recommend that you apply the latest security updates and critical updates including general distribution releases (GDRs), service packs (SPs), and cumulative updates (CUs).	https://support.microsoft.com/help/321185/how-to-determine-the-version-edition-and-update-level-of-sql-server-an, https://docs.microsoft.com/sql/database-engine/install-windows/install-sql-server-servicing-updates	['SQLServerVersion']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
57	FKNoIndexes	Warning	Foreign key constraints should have corresponding indexes	Create a corresponding index for each foreign key. There is no index on the following 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	['FKNoIndexes']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|model|msdb|tempdb)$/
58	MissedIndexes	Information	Potentially missing indexes	Create an 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	['MissedIndexes']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|model|msdb|tempdb)$/
59	FullBackup	Warning	Full backup is missed or outdated	The last full backup had been created more than @{threshold} days ago. Create a new full backup.	['DefaultRuleset', 'Backup']	Database doesn't have any full backup or the latest full backup is over 7 days.	https://docs.microsoft.com/sql/relational-databases/backup-restore/create-a-full-database-backup-sql-server	['DatabaseBackups']	Database	/^(Windows|Linux)$/	OnPremises	[11.0,)	/^(model|tempdb)$/	7
60	OutdatedTranLogBackup	Warning	Transaction Log backup is missed or outdated	Create a backup of Transaction Log. 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	['DatabaseBackups']	Database	/^(Windows|Linux)$/	OnPremises	[11.0,)	/^(master|model|msdb|tempdb)$/
61	DbDiffCollation	Warning	Database collation doesn't match the collation of master	Keep database collation the same as the collation for master or model	['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	['DatabaseConfiguration']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
62	AutoClose	Warning	Auto Close Option should be OFF	Set AUTO_CLOSE option to OFF	['DefaultRuleset', 'Performance', 'DBConfiguration']	When AUTO_CLOSE is set ON, this can cause performance degradation on frequently accessed databases because of the increased overhead of opening and closing the database after each connection. AUTO_CLOSE also flushes the procedure cache after each connection.	https://docs.microsoft.com/sql/relational-databases/policy-based-management/set-the-auto-close-database-option-to-off	['DatabaseConfiguration']	Database	/^(Windows|Linux)$/	OnPremises	[11.0,)	/^(master|msdb|tempdb)$/
63	AutoShrink	Warning	Auto Shrink Option should be OFF	Set AUTO_SHRINK option to OFF	['DefaultRuleset', 'DBConfiguration', 'Performance']	Shrinking databases is the fastest way to achieve fragmentation. SQL Server goes to the last page in the database, moves it to the first free available space, and then repeats the process again. This shuffles the deck, putting your pages out of order.	https://blogs.msdn.microsoft.com/buckwoody/2009/07/01/sql-server-best-practices-auto-shrink-should-be-off	['DatabaseConfiguration']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|msdb|tempdb)$/
64	PageVerify	Warning	PAGE_VERIFY option should be CHECKSUM	Set PAGE_VERIFY option to CHECKSUM	['DefaultRuleset', 'DBConfiguration', 'DataIntegrity']	When CHECKSUM is enabled for the PAGE_VERIFY database option, the SQL Server Database Engine calculates a checksum over the contents of the whole page, and stores the value in the page header when a page is written to disk. When the page is read from disk, the checksum is recomputed and compared to the checksum value that is stored in the page header. This helps provide a high level of data-file integrity.	https://docs.microsoft.com/sql/relational-databases/policy-based-management/set-the-page-verify-database-option-to-checksum	['DatabaseConfiguration']	Database	/^(Windows|Linux)$/	OnPremises	[11.0,)	/^(master|msdb|tempdb)$/
65	DbChaining	Warning	Cross-Database Access should be disabled	Set DB_CHAINING option to OFF	['DefaultRuleset', 'DBConfiguration', 'Security']	Ownership chaining across databases is turned off by default. Microsoft recommends that you disable cross-database ownership chaining because it exposes you to the additional security risks.	https://docs.microsoft.com/dotnet/framework/data/adonet/sql/enabling-cross-database-access-in-sql-server	['DatabaseConfiguration']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|msdb|tempdb)$/
66	AutoCreateStatsIncremental	Warning	Incremental option of auto stats should be ON	Set AUTO_CREATE_STATISTICS to ON and set INCREMENTAL to ON	['DefaultRuleset', 'DBConfiguration', 'Statistics', 'Performance']	Incremental statistics update at partition level is a feature introduced in SQL Server 2014. When the option INCREMENTAL is turn on at the database level, newly auto created column statistics will use incremental statistics on partitioned tables by default.	https://docs.microsoft.com/sql/relational-databases/statistics/statistics	['DatabaseConfiguration']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[12.0,)	/^(master|msdb|tempdb)$/
67	TrustWorthy	Warning	TRUSTWORTHY should be OFF	Set TRUSTWORTHY option to OFF	['DefaultRuleset', 'DBConfiguration', 'Security']	You can use the TRUSTWORTHY database setting to indicate whether the instance of Microsoft SQL Server trusts the database and the contents within the database. By default, this setting is set to OFF to mitigate certain threats that may be present when a database is attached to the server.	https://support.microsoft.com/help/2183687/guidelines-for-using-the-trustworthy-database-setting-in-sql-server	['DatabaseConfiguration']	Database	/^(Windows|Linux)$/	OnPremises	[11.0,)	/^(master|msdb|tempdb)$/
68	ParameterizationNotSimple	Warning	PARAMETERIZATION should be SIMPLE	Set PARAMETERIZATION = SIMPLE and use forced parameterization only on a certain class of queries, instead of all queries	['DefaultRuleset', 'DBConfiguration', 'Performance', 'QueryOptimizer']	When the PARAMETERIZATION database option is set to SIMPLE, the SQL Server query optimizer may choose to parameterize the queries. This means that any literal values that are contained in a query are substituted with parameters. This process is referred to as simple parameterization. When SIMPLE parameterization is in effect, you cannot control which queries are parameterized and which queries are not. However, you can specify that all queries in a database be parameterized by setting the PARAMETERIZATION database option to FORCED. Regardless of whether you have a Plan-Stability or not, SQL Server will always auto parameterize your SQL Statements, and reuse the cached execution plan over and over again. It doesn't matter how terrible the execution plan is. Therefore you have to know in exact detail the shape of your execution plans, and whether they can lead to some performance related problems.	https://docs.microsoft.com/sql/relational-databases/performance/specify-query-parameterization-behavior-by-using-plan-guides	['DatabaseConfiguration']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|msdb|tempdb)$/
69	TempDBFilesNotSameSize	Warning	TempDB data files are not the same size	Make all TempDB data files the same size	['DefaultRuleset', 'TempDB', 'Performance', 'DBFileConfiguration']	We recommend that you create all TempDB data files at the same size.	https://support.microsoft.com/kb/2154845	['TempDBFiles']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
70	TempDBFilesMultiple4	Warning	Number of TempDB data files should be in multiples of 4	Make sure number of TempDB data files is in multiples of 4	['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	[{'id': 'DatabaseMasterFiles', 'params': {'dbId': 2, 'type': 0}, 'transform': {'type': 'aggregate', 'map': {'physical_name': 'count'}}}, 'ServerInstanceConfiguration']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
71	TempDBFiles1PerCPU	Warning	Number of TempDB data files should depend on CPU count	Make sure to have 1 data file per logical processor (processors count: @{online_logical_processors})	['DefaultRuleset', 'TempDB', 'Performance', 'DBFileConfiguration']	Number of TempDB data files should correlate with the number of (logical) processors on the machine. As a general rule, if the number of logical processors is less than or equal to 8, use the same number of data files as logical processors. If the number of logical processors is greater than 8, use 8 data files and then if contention continues, increase the number of data files by multiples of 4 until the contention is reduced to acceptable levels or make changes to the workload/code.	https://support.microsoft.com/kb/2154845	[{'id': 'DatabaseMasterFiles', 'params': {'dbId': 2, 'type': 0}, 'transform': {'type': 'aggregate', 'map': {'physical_name': 'count'}}}, 'ServerInstanceConfiguration']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
72	TempDBFilesNotLess8	Warning	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	[{'id': 'DatabaseMasterFiles', 'params': {'dbId': 2, 'type': 0}, 'transform': {'type': 'aggregate', 'map': {'physical_name': 'count'}}}, 'ServerInstanceConfiguration']	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
73	TempDBFilesAutoGrowth	Warning	TempDB data files have different auto growth settings	Make Autogrowth settings the same for each TempDB data file	['DefaultRuleset', 'TempDB', 'Performance', 'DBFileConfiguration']	TempDB data files should be of equal size within each filegroup, as SQL Server uses a proportional-fill algorithm that favors allocations in files with more free space.	https://docs.microsoft.com/sql/relational-databases/databases/tempdb-database	[{'id': 'DatabaseMasterFiles', 'params': {'dbId': 2, 'type': 0}, 'transform': {'type': 'aggregate', 'map': {'growth': 'count', 'is_percent_growth': 'count'}}}]	Server	/^(Windows|Linux)$/	OnPremises	[11.0,)
74	FilesAutogrowth	Warning	Database files have Autogrowth setting 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	['Autogrow1GB']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[13.0.4001,)
75	DuplicateIndexes	Warning	There are tables with duplicate indexes	Consider removing duplicate indexes in table @{Table}: @{ToDelete}	['DefaultRuleset', 'Performance', 'Indexes']	There are tables with duplicate indexes according to their definitions. We recommended to revise all these objects as soon as possible.	https://docs.microsoft.com/sql/relational-databases/sql-server-index-design-guide	[{'id': 'IndexesDefinitions', 'transform': {'type': 'duplicateIndexes'}}]	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|model|msdb|tempdb)$/
76	RedundantIndexes	Warning	There are tables with possibly redundant indexes	Consider removing redundant indexes in table @{Table}: @{Indexes}	['DefaultRuleset', 'Performance', 'Indexes']	There are tables with possibly redundant indexes according to the set of key and included columns. We recommended to revise all these objects as soon as possible.	https://docs.microsoft.com/sql/relational-databases/sql-server-index-design-guide	[{'id': 'IndexesDefinitions', 'transform': {'type': 'redundantIndexes'}}]	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|model|msdb|tempdb)$/
77	UserObjectsInMaster	Warning	User objects in database master	Remove user objects from database master: @{Object_Name}	['DefaultRuleset', 'masterDB', 'Backup']	We highly recommend you not create user objects in the master database. If it's unavoidable for some reason, make sure to back up the database more frequently.	https://docs.microsoft.com/sql/relational-databases/databases/master-database	['UserObjectsCountInMasterDB']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
78	HighCPUUsage	Warning	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	['CpuUsage']	Server	Windows	OnPremises, ManagedInstance	[11.0,)		70
79	ReplErrors24H	Warning	Replication errors in the last 24 hours	Review replication errors for the following 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	['ReplicationErrors']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
80	AgentAlertsSeverity10	Warning	Agent doesn't rise alerts for errors with severity 10	Consider creating alerts for the following errors: @{error_ids}	['DefaultRuleset', 'Agent']	Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.	https://docs.microsoft.com/sql/ssms/agent/alerts	['SysAlerts']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
81	AgentAlertsSeverity16	Warning	Agent doesn't rise alerts for errors with severity 16	Consider creating alerts for the following 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	['SysAlerts']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
82	AgentAlertsSeverity17	Warning	Agent doesn't rise alerts for errors with severity 17	Consider creating alerts for the following errors: @{error_ids}	['DefaultRuleset', 'Agent']	Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.	https://docs.microsoft.com/sql/ssms/agent/alerts	['SysAlerts']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
83	AgentAlertsSeverity19	Warning	Agent doesn't rise alerts for errors with severity 19	Consider creating alerts for the following 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	['SysAlerts']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
84	AgentAlertsSeverity20	Warning	Agent doesn't rise alerts for errors with severity 20	Consider creating alerts for the following errors: @{error_ids}	['DefaultRuleset', 'Agent']	Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.	https://docs.microsoft.com/sql/ssms/agent/alerts	['SysAlerts']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
85	AgentAlertsSeverity21	Warning	Agent doesn't rise alerts for errors with severity 21	Consider creating alerts for the following 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	['SysAlerts']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
86	AgentAlertsSeverity22	Warning	Agent doesn't rise alerts for errors with severity 22	Consider creating alerts for the following errors: @{error_ids}	['DefaultRuleset', 'Agent']	Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.	https://docs.microsoft.com/sql/ssms/agent/alerts	['SysAlerts']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
87	AgentAlertsSeverity23	Warning	Agent doesn't rise alerts for errors with severity 23	Consider creating alerts for the following 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	['SysAlerts']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
88	AgentAlertsSeverity24	Warning	Agent doesn't rise alerts for errors with severity 24	Consider creating alerts for the following errors: @{error_ids}	['DefaultRuleset', 'Agent']	Events are generated by SQL Server and entered into the Microsoft Windows application log. SQL Server Agent reads the application log and compares events written there to alerts that you have defined. When SQL Server Agent finds a match, it fires an alert, which is an automated response to an event. In addition to monitoring SQL Server events, SQL Server Agent can also monitor performance conditions and Windows Management Instrumentation (WMI) events.	https://docs.microsoft.com/sql/ssms/agent/alerts	['SysAlerts']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
89	WeakPassword	Warning	Weak password	Make sure to set strong passwords on the following logins: @{PasswordData}	['DefaultRuleset', 'Security', 'WeakPassword']	Some user logins have weak passwords.	https://docs.microsoft.com/sql/relational-databases/security/strong-passwords	['WeakPassword']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
90	VLFCount	Warning	VLF count	Update transaction log settings to reduce the number of VLFs (current number is: @{RecoveryUnitId})	['DefaultRuleset', 'Backup', 'Performance']	The SQL Server Database Engine divides each physical log file internally into a number of virtual log files (VLFs). Virtual log files have no fixed size, and there is no fixed number of virtual log files for a physical log file. The Database Engine chooses the size of the virtual log files dynamically while it is creating or extending log files. The Database Engine tries to maintain a small number of virtual files. The size of the virtual files after a log file has been extended is the sum of the size of the existing log and the size of the new file increment. The size or number of virtual log files cannot be configured or set by administrators. If the log files grow to a large size in many small increments, they will have many virtual log files. This can slow down database startup and also log backup and restore operations. Conversely, if the log files are set to a large size with few or just one increment, they will have few very large virtual log files. We recommend that you assign log files a size value close to the final size required, using the required increments to achieve optimal VLF distribution, and also have a relatively large growth_increment value.	https://docs.microsoft.com/sql/relational-databases/sql-server-transaction-log-architecture-and-management-guide	[{'id': 'VLF', 'transform': {'type': 'aggregate', 'map': {'RecoveryUnitId': {'type': 'count', 'distinct': False}}}}]	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)		50
91	TF8015	Warning	TF 8015 disables auto-detection and NUMA setup	Disable trace flag 8015 for this SQL Server instance. This TF 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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,11.0.3349)
92	TF8032	Warning	TF 8032 reverts the cache limit parameters to the SQL Server 2005 RTM	The cache limit parameters reverted 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	['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.		['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,)
93	TF8744	Warning	TF 8744 disables pre-fetching for the Nested Loop operator	Disable trace flag 8744 for this SQL Server instance. This TF does not apply to this SQL Server version	['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	['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,12.0)
94	TF9347	Warning	TF 9347 disables batch mode for sort operator	Disable trace flag 9347 for this SQL Server instance. This TF 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.		['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,13.0)
95	TF9349	Warning	TF 9349 disables batch mode for top N sort operator	Disable trace flag 9349 for this SQL Server instance. This TF 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.		['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,13.0)
96	TF9389	Warning	TF 9389 enables dynamic memory grant for batch mode operators	Disable trace flag 9389 for this SQL Server instance. The TF 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.		['EnabledGlobalTraceFlags']	Server	Windows	OnPremises, ManagedInstance	[11.0,13.0)
97	TF9476	Warning	TF 9476 causes SQL Server to generate a plan using the Simple Containment	Disable trace flag 9476 for this SQL Server instance. The TF 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.		['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,13.0)
98	TF9481	Warning	TF 9481 enables Legacy CE model, irrespective of the compatibility level of the database	Disable trace flag 9481 for this SQL Server instance. The TF 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.		['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,12.0)
99	TF10204	Warning	TF 10204 disables merge/recompress during columnstore index reorganization	Disable trace flag 10204 for this SQL Server instance. The TF 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.		['EnabledGlobalTraceFlags']	Server	Windows	OnPremises	[11.0,13.0)
100	SPNaming	Warning	Stored Procedure Naming	Rename the following stored procedures to get rid of the 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)	['BadNamingSP']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
101	ObjectNamingSpecialChar	Warning	Object Naming	Rename the following objects to get rid of special characters: @{ObjectName}	['DefaultRuleset', 'Naming']	If you name a database object by using any character in the following table, you make it more difficult not only to reference that object but also to read code that contains the name of that object.	https://docs.microsoft.com/previous-versions/visualstudio/visual-studio-2010/dd172134(v=vs.100)	['BadNamingSpecialChars']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
102	ColumnNamingSpecialChar	Warning	Column Naming	Rename the following columns to get rid of 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)	['BadNamingSpecialCharsColumns']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
103	FnNaming	Warning	User Function Naming	Rename the following functions to get rid of the fn_ prefix: @{ObjectName}	['DefaultRuleset', 'Naming']	In SQL Server, the fn_ prefix designates system functions. If you use that prefix for your functions, the name of your function might conflict with the name of a system function that will be created in the future. If such a conflict occurs, your application might break if your application refers to the function without qualifying the reference by schema. In this situation, the name will bind to the system function instead of to your function.	https://docs.microsoft.com/sql/t-sql/statements/create-function-transact-sql	['BadNamingUserFunctions']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
104	ObjectNamingResKeywords	Warning	Object names contain reserved keywords	Rename the following objects to get rid of 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	['BadNamingKeywords']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
105	DeprFeaturesInModules	Warning	Use of deprecated or discontinued features in modules	Consider getting rid of the following deprecated or discontinued features in @{ObjectName}: @{Keyword}	['DefaultRuleset', 'Security', 'Deprecated', 'LongRunningChecks', 'UpdateIssues']	Deprecated features are scheduled to be removed in a future release of SQL Server. Discontinued features have been removed from specific versions of SQL Server.	https://docs.microsoft.com/sql/relational-databases/performance-monitor/sql-server-deprecated-features-object	['DeprecatedFeaturesSQLModules']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|tempdb|model|msdb)$/
106	DeprFeaturesInJobs	Warning	Use of deprecated or discontinued features in modules	Consider getting rid of the following deprecated or discontinued features in job @{ObjectName}: @{Keyword}	['DefaultRuleset', 'Security', 'Deprecated', 'Agent', 'Jobs', 'LongRunningChecks', 'UpdateIssues']	Deprecated features are scheduled to be removed in a future release of SQL Server. Discontinued features have been removed from specific versions of SQL Server.	https://docs.microsoft.com/sql/relational-databases/performance-monitor/sql-server-deprecated-features-object	['DeprecatedFeaturesJobs']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
107	NUMANodeSingleCPU	Warning	Single CPU assigned to NUMA node	Consider assigning additional CPUs to NUMA nodes that have only one assigned 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)	['ServerInstanceConfiguration']	Server	Windows	OnPremises, ManagedInstance	[11.0,)
108	NUMANodeNoCPU	Warning	NUMA nodes without CPUs	Make sure that all NUMA nodes have assigned CPUs	['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)	['AffinityNUMANodeNoAssignedCPUs']	Server	Windows	OnPremises, ManagedInstance	[11.0,)
109	IndexKeyGuid	Warning	Guid in clustered index key column	Get rid of GUIDs in the following 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/	['IndexesGuidKeyColumns']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|tempdb|model|msdb)$/
110	IndexesLargeKeys	Warning	Indexes keys with more than 900 bytes	Get rid of keys larger than 900 bytes in index @{FullName}	['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	['IndexesDefinitions']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,13.0)	/^(master|model|msdb|tempdb)$/
111	IndexesLargeKeysNonClust	Warning	NonClustered indexes keys with more than 1700 bytes	Get rid of keys larger than 1700 bytes in index @{FullName}	['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	['IndexesDefinitions']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[13.0,)	/^(master|model|msdb|tempdb)$/
112	IndexesLargeKeysClust	Warning	Clustered indexes keys with more than 900 bytes	Get rid of keys larger than 900 bytes in index @{FullName}	['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	['IndexesDefinitions']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[13.0,)	/^(master|model|msdb|tempdb)$/
113	DisabledIndexes	Warning	Disabled Indexes exist	Remove or enable this 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	['IndexesDefinitions']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|model|msdb|tempdb)$/
114	IndexesFillFactor	Warning	Index fill factor lower 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	['IndexesDefinitions']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|model|msdb|tempdb)$/
115	NonUniqueClusterIndex	Warning	Non-unique clustered indexes	Review this clustered index @{FullName} as it is non-unique	['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	['IndexesDefinitions']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|model|msdb|tempdb)$/
116	SuspectPages	Warning	Suspect pages	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	['SuspectPagesValidation']	Database	/^(Windows|Linux)$/		[11.0,)
117	SparseFiles	Warning	Sparse files	Get rid of sparse files: @{SparseFiles}	['DefaultRuleSet', 'Snapshots', 'Backup', 'DataIntegrity']	If the file is sparse or compressed, the NTFS file system may deallocate disk space in the file. This sets the range of bytes to zeroes (0) without extending the file size.	https://blogs.msdn.microsoft.com/jorgepc/2010/11/25/what-are-sparse-files-and-why-should-i-care-as-sql-server-dba/, https://techcommunity.microsoft.com/t5/SQL-Server-Support/Did-your-backup-program-utility-leave-your-SQL-Server-running-in/ba-p/315840	['SparseFilesValidation']	Database	/^(Windows|Linux)$/		[11.0,)
118	TableNoIndex	Warning	Tables without indexes	Review table @{TableName} 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	['TableIndexes']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|tempdb|model|msdb)$/
119	TableNoClusteredIndex	Warning	Tables without clustered indexes	Review table @{TableName} and consider creating a 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	['TableIndexes']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|tempdb|model|msdb)$/
120	TablePSAlign	Warning	Table index not aligned with PS	Consider recreating index @{IndexName} in table @{TableName} to have it aligned with your 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	['TableIndexesPartitioned']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|tempdb|model|msdb)$/
121	LoginNoPassword	Warning	Logins with no passwords	Make sure to set strong passwords on the following logins: @{PasswordData}	['DefaultRuleset', 'Security', 'WeakPassword']	Password complexity policies are designed to deter brute force attacks by increasing the number of possible passwords.	https://docs.microsoft.com/sql/relational-databases/security/password-policy	['NullPassword']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
122	LoginEqPassword	Warning	Logins with passwords that are same as the login names	Please review logins with password equals to login: @{PasswordData}	['DefaultRuleset', 'Security', 'WeakPassword']	Password complexity policies are designed to deter brute force attacks by increasing the number of possible passwords.	https://docs.microsoft.com/sql/relational-databases/security/password-policy	['NamePassword']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
123	SystemHealth	Warning	System Health important messages	Error @{Error_Number} has 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	['SystemHealth']	Server	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)
124	RarelyUsedIndex	Warning	Rarely used index	Make sure you need index @{IndexName} as it's used too rarely	['DefaultRuleset', 'Indexes', 'Performance']	Rarely used indexes can slow down database's performance. Time of write operations is increased because of index maintenance, but index is not used quite often. It makes sense to compare impact of writing operations versus rare reading speedup.	https://docs.microsoft.com/sql/t-sql/statements/drop-index-transact-sql	['IndexesDefinitions']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|model|msdb|tempdb)$/
125	UnusedIndex	Warning	Unused index	Make sure you need index @{IndexName} as it's unused	['DefaultRuleset', 'Index', 'Performance']	Unused indexes can slow down database's performance. Time of write operations is increased because of index maintenance, but index is not used anywhere.	https://docs.microsoft.com/sql/t-sql/statements/drop-index-transact-sql	['IndexesDefinitions']	Database	/^(Windows|Linux)$/	OnPremises, ManagedInstance	[11.0,)	/^(master|model|msdb|tempdb)$/
126	SkewedCompatibilityLevel	Warning	Database with skewed compatibility level	Update database compatibility level (current level: @{CompatibilityLevel})	['DefaultRuleset', 'CompatibilityLevel', 'Security', 'Performance', 'UpdateIssues']	Some databases may have a compatibility level lower than the allowed level by the Database Engine.	https://docs.microsoft.com/sql/t-sql/statements/alter-database-transact-sql-compatibility-level	['CompatibilityLevel', 'SQLServerVersion']	Database	/^(Windows|Linux)$/		[11.0,)