Sunday, May 22, 2011

Find Missing Indexes

Once again the dynamic management views to rescue. Found this from brent ozar's blog havent really used it as i was working on production environment when i came across this but it would be worth a try to carefully deploy these one by one and check for the usage.


SELECT sys.objects.name
, (avg_total_user_cost * avg_user_impact) * (user_seeks + user_scans) AS Impact
, 'CREATE NONCLUSTERED INDEX ix_IndexName ON ' + sys.objects.name COLLATE DATABASE_DEFAULT + ' ( ' + IsNull(mid.equality_columns, '') +
CASE WHEN mid.inequality_columns IS NULL THEN
''
ELSE
CASE WHEN mid.equality_columns IS NULL THEN
''
ELSE
','
END + mid.inequality_columns
END + ' ) '
+
CASE WHEN mid.included_columns IS NULL THEN
''
ELSE
'INCLUDE (' + mid.included_columns + ')'
END + ';' AS CreateIndexStatement
, mid.equality_columns
, mid.inequality_columns
, mid.included_columns
FROM sys.dm_db_missing_index_group_stats AS migs
INNER JOIN sys.dm_db_missing_index_groups AS mig
ON migs.group_handle = mig.index_group_handle
INNER JOIN sys.dm_db_missing_index_details AS mid
ON mig.index_handle = mid.index_handle
AND mid.database_id = DB_ID()
INNER JOIN sys.objects WITH (nolock)
ON mid.OBJECT_ID = sys.objects.OBJECT_ID
WHERE
(
migs.group_handle IN (
SELECT TOP (500) group_handle
FROM sys.dm_db_missing_index_group_stats WITH (nolock)
ORDER BY (avg_total_user_cost * avg_user_impact) * (user_seeks + user_scans) DESC
)
)
AND OBJECTPROPERTY(sys.objects.OBJECT_ID, 'isusertable' )=1
ORDER BY 2 DESC , 3 DESC


click here to view brents video

1 comment:

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