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check missing index Expand / Collapse
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Posted Monday, May 13, 2013 4:38 PM
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Is there some good queries for checking missing indexes on all tables of a database?

THanks
Post #1452356
Posted Tuesday, May 14, 2013 2:37 AM


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try below query

SELECT
mid.statement
,migs.avg_total_user_cost * (migs.avg_user_impact / 100.0) * (migs.user_seeks + migs.user_scans) AS improvement_measure,OBJECT_NAME(mid.Object_id),
'CREATE INDEX [missing_index_' + CONVERT (VARCHAR, mig.index_group_handle) + '_' + CONVERT (VARCHAR, mid.index_handle)
+ '_' + LEFT (PARSENAME(mid.statement, 1), 32) + ']'
+ ' 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 migs.avg_total_user_cost * (migs.avg_user_impact / 100.0) * (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
Post #1452428
Posted Tuesday, May 14, 2013 3:01 AM


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Do not automatically create all the indexes that the missing index DMVs suggest, that's a good way to severely over-index and hinder performance.

Evaluate what the missing index DMVs suggest, examine the existing indexes, test the suggestions, implement what's useful.



Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #1452441
Posted Tuesday, May 14, 2013 4:09 AM


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And remember, the missing index information, as is, doesn't relate directly to any query at all. So simply taking that stuff as written, you might be creating an index for a query that was run once and then never again.

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Post #1452481
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