Sunday, December 21, 2008

Using Missing Indexes DMVs to generate index suggestions

I came across this today.
It uses the missing_indexes dmvs to recommend where indexes could be added.
Have modified it to include the table schema.
SELECT     'CREATE NONCLUSTERED INDEX NewNameHere ON ' + sys.schemas.name + '.' + sys.objects.name + ' ( ' + 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 
INNER JOIN   sys.objects WITH (nolock) ON mid.object_id = sys.objects.object_id
INNER JOIN   sys.schemas ON sys.objects.schema_id = sys.schemas.schema_id 
WHERE     (migs.group_handle IN
(SELECT     TOP 100 PERCENT 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 sys.objects.type = 'U'


Original Piece


MSDN : Using Missing Index Information to Write CREATE INDEX Statements



Brian Knight's blog on the Missing Index DMV

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