SQLServerWiki

“The Only Thing That Is Constant Is Change”

Script to find Missing Indexes.

Posted by database-wiki on December 20, 2012

DECLARE @runtime datetime
DECLARE @cpu_time_start bigint, @cpu_time bigint, @elapsed_time_start bigint, @rowcount bigint
DECLARE @queryduration int, @qrydurationwarnthreshold int
DECLARE @querystarttime datetime
SET @runtime = GETDATE()
SET @qrydurationwarnthreshold = 5000
SELECT CONVERT (varchar, @runtime, 126) AS runtime,
mig.index_group_handle, mid.index_handle,
CONVERT (decimal (28,1), migs.avg_total_user_cost * migs.avg_user_impact * (migs.user_seeks + migs.user_scans)) AS improvement_measure,
‘CREATE INDEX missing_index_’ + CONVERT (varchar, mig.index_group_handle) + ‘_’ + CONVERT (varchar, mid.index_handle)
+ ‘ ON ‘ + mid.statement
+ ‘ (‘ + ISNULL (mid.equality_columns,”)
+ CASE WHEN mid.equality_columns IS NOT NULL AND mid.inequality_columns IS NOT NULL THEN ‘,’ ELSE ” END + ISNULL (mid.inequality_columns, ”)
+ ‘)’
+ ISNULL (‘ INCLUDE (‘ + mid.included_columns + ‘)’, ”) AS create_index_statement,
migs.*, mid.database_id, mid.[object_id]
FROM sys.dm_db_missing_index_groups mig
INNER JOIN sys.dm_db_missing_index_group_stats migs ON migs.group_handle = mig.index_group_handle
INNER JOIN sys.dm_db_missing_index_details mid ON mig.index_handle = mid.index_handle
WHERE CONVERT (decimal (28,1), migs.avg_total_user_cost * migs.avg_user_impact * (migs.user_seeks + migs.user_scans)) > 10
ORDER BY migs.avg_total_user_cost * migs.avg_user_impact * (migs.user_seeks + migs.user_scans) DESC
PRINT ”
GO

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