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Initial commit sp_drop_create_stats_external_table
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Sergio Govoni
+213
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------------------------------------------------------------------------
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-- Project: sp_drop_create_stats_external_table --
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-- --
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-- The stored procedure is able to generate all the --
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-- T-SQL statements for drop and create statistics --
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-- defined on SQL Server external tables in your --
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-- database! --
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-- --
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-- File: Stored procedure implementation --
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-- Author: Sergio Govoni https://www.linkedin.com/in/sgovoni/ --
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-- Notes: -- --
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------------------------------------------------------------------------
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IF OBJECT_ID('dbo.sp_drop_create_stats_external_table', 'P') IS NOT NULL
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DROP PROCEDURE dbo.sp_drop_create_stats_external_table;
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GO
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CREATE PROCEDURE dbo.sp_drop_create_stats_external_table
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AS BEGIN
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/*
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Author: Sergio Govoni https://www.linkedin.com/in/sgovoni/
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Version: 1.0
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License: MIT License
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*/
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DECLARE
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-- Output table
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@DropCreateSQLCmd TABLE
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(
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ID INTEGER IDENTITY(1, 1) NOT NULL
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,SchemaName SYSNAME NOT NULL
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,TableName SYSNAME NOT NULL
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,ObjectType SYSNAME NOT NULL
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,OperationType NCHAR(1) NOT NULL
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,SQLCmd NVARCHAR(1024) NOT NULL
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);
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-- Generate CREATE STATISTICS statements
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WITH StatCreate AS
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(
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SELECT
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'A' AS RowType
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,T.[object_id]
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,T.stats_id
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,T.StatLevel
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,T.KeyOrdinal
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,T.SchemaName
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,T.TableName
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,CAST('CREATE ' +
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'STATISTICS [' + TRIM(T.StatsName) +
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'] ON [' + TRIM(T.SchemaName) +
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'].[' + TRIM(T.TableName) +
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'] ( ' AS VARCHAR(MAX)) AS SQLCmd
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FROM
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(
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SELECT
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DISTINCT
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stat.[object_id]
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,stat.stats_id
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,CAST(0 AS INTEGER) AS StatLevel
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,CAST(0 AS INTEGER) AS KeyOrdinal
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,stat.name AS StatsName
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,sch.name AS SchemaName
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,obj.name AS TableName
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FROM
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sys.stats_columns AS statc
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JOIN
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sys.stats AS stat ON ((stat.stats_id = statc.stats_id)
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AND (stat.[object_id] = statc.[object_id]))
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JOIN
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sys.objects AS obj ON statc.[object_id] = obj.[object_id]
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JOIN
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sys.external_tables external_tab ON ((external_tab.[object_id] = obj.[object_id])
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AND (external_tab.[schema_id] = obj.[schema_id]))
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JOIN
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sys.columns AS col ON ((col.column_id = statc.column_id)
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AND (col.[object_id] = statc.[object_id]))
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JOIN
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sys.schemas AS sch ON obj.[schema_id] = sch.[schema_id]
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WHERE
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((stat.auto_created = 1) OR (stat.user_created = 1))
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AND (obj.type = 'U')
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) AS T
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UNION ALL
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SELECT
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'R' AS RowType
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,statcol.[object_id]
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,statcol.stats_id
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,CAST(S.StatLevel + 1 AS INTEGER) AS IdxLevel
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,CAST(statcol.stats_column_id AS INTEGER) AS KeyOrdinal
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,S.SchemaName
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,S.TableName
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,CAST(S.SQLCmd + CASE(statcol.stats_column_id) WHEN 1 THEN '' ELSE ',' END +
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'[' + TRIM(col.name) +
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'] ' AS VARCHAR(MAX)) AS SQLCmd
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FROM
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StatCreate AS S
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JOIN
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sys.stats_columns AS statcol ON ((statcol.[object_id] = S.[object_id])
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AND (statcol.stats_id = S.stats_id))
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JOIN
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sys.columns AS col ON ((col.column_id = statcol.column_id)
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AND (col.[object_id] = statcol.[object_id]))
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WHERE
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(statcol.stats_column_id = (S.KeyOrdinal + 1))
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),
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StatCreateGroup AS
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(
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SELECT
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MAX(S.KeyOrdinal) AS MaxKeyOrdinal
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,S.[object_id]
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,S.stats_id
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FROM
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StatCreate AS S
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JOIN
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sys.objects AS O ON O.[object_id] = S.[object_id]
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WHERE
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(S.RowType = 'R')
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GROUP BY
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S.[object_id]
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,S.stats_id
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)
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INSERT INTO @DropCreateSQLCmd
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(
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SchemaName
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,TableName
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,ObjectType
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,OperationType
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,SQLCmd
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)
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SELECT
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StatCreate.SchemaName
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,StatCreate.TableName
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,'STATS' AS ObjecType
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,'C' AS OperationType
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,StatCreate.SQLCmd + ') WITH FULLSCAN;' AS SQLCmd
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FROM
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StatCreateGroup
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JOIN
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StatCreate ON ((StatCreate.[object_id] = StatCreateGroup.[object_id])
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AND (StatCreate.stats_id = StatCreateGroup.stats_id))
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AND (StatCreate.KeyOrdinal = StatCreateGroup.MaxKeyOrdinal);
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-- Generate DROP STATISTICS statements
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WITH StatsDrop AS
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(
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SELECT
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T.SchemaName
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,T.TableName
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,'STATS' AS ObjectType
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,'D' AS OperationType
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,'DROP STATISTICS [' +
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TRIM(SchemaName) + '].[' +
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TRIM(TableName) + '].[' +
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TRIM(StatisticName) + '];' AS SQLCmd
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FROM (
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SELECT
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sch.[Name] as SchemaName
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,obj.[Name] as TableName
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,stat.[Name] as StatisticName
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FROM
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sys.stats AS stat
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INNER JOIN
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sys.objects AS obj ON stat.[object_id] = obj.[object_id]
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INNER JOIN
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sys.external_tables external_tab ON ((external_tab.[object_id] = obj.[object_id])
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AND (external_tab.[schema_id] = obj.[schema_id]))
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INNER JOIN
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sys.schemas AS sch ON obj.[schema_id] = sch.[schema_id]
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WHERE
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((stat.auto_created = 1) OR (stat.user_created = 1))
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AND (obj.type = 'U')
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) AS T
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)
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INSERT INTO @DropCreateSQLCmd
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(
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SchemaName
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,TableName
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,ObjectType
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,OperationType
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,SQLCmd
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)
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SELECT
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SchemaName
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,TableName
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,ObjectType
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,OperationType
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,SQLCmd
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FROM
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StatsDrop;
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SELECT
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ID
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,SchemaName
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,TableName
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,ObjectType
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,OperationType
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,SQLCmd
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FROM
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@DropCreateSQLCmd;
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RETURN;
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END;
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GO
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/*
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EXEC dbo.sp_drop_create_stats_external_table;
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GO
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*/
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