The eternal search for missing indexes, part 1

Hi eveyone! I will begin my participation in this column by honoring Bart Duncan for a script utilizing dynamic management views (also known as DMV:s for short). The script simply lists up to 500 CREATE INDEX statements from three joined DMV:s. For the DBA user it is as simple as: cut – paste – execute. Here is the script:

SELECT 

migs.avg_total_user_cost * (migs.avg_user_impact / 100.0) * (migs.user_seeks + migs.user_scans) AS improvement_measure

, '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

Bart Duncan´s original post can be found here: http://blogs.msdn.com/b/bartd/archive/2007/07/19/are-you-using-sql-s-missing-index-dmvs.aspx Now, test this at home and I will return next week with my usage recommendations 🙂