Script to find the missing indexes

Performance tuning in SQL is important exercise and index creation is an important part of it. Sometimes base on the frequent SQL queries, we need to create some indexes or missing indexes which are enhance the query performance. Below script will help in finding the missing indexes.

SELECT db_name(d.database_id) dbname
, object_name(d.object_id) tablename
, d.equality_columns
, d.inequality_columns
, d.included_columns
,'CREATE INDEX [missing_index_' + CONVERT (varchar, g.index_group_handle)
 + '_' + CONVERT (varchar, d.index_handle)
+ '_' + LEFT (PARSENAME(d.statement, 1), 32) + ']'
+ ' ON ' + d.statement
+ ' (' + ISNULL (d.equality_columns,'')
+ CASE WHEN d.equality_columns IS NOT NULL 
AND d.inequality_columns IS NOT NULL THEN ',' ELSE '' END
+ ISNULL (d.inequality_columns, '')
+ ')'
+ ISNULL (' INCLUDE (' + d.included_columns + ')', '') AS create_index_statement
FROM  sys.dm_db_missing_index_groups g
join sys.dm_db_missing_index_group_stats gs ON gs.group_handle = g.index_group_handle
join sys.dm_db_missing_index_details d ON g.index_handle = d.index_handle
WHERE  d.database_id =  'Database_id' and d.object_id =  d.object_id
ORDER BY 2 DESC