SQL SERVER – Missing Index Script
Performance Tuning is quite interesting and Index plays a vital role in it. A proper index can improve the performance and a bad index can hamper the performance. In this post we will discuss about Missing Index.
Please note, if you should not create all the missing indexes this script suggest. This is just for guidance. You should not create more than 5-10 indexes per table
-- Missing Index ScriptSELECTTOP25dm_mid.database_id ASDatabaseID,dm_migs.avg_user_impact*(dm_migs.user_seeks+dm_migs.user_scans) Avg_Estimated_Impact,dm_migs.last_user_seek ASLast_User_Seek,OBJECT_NAME(dm_mid.OBJECT_ID,dm_mid.database_id) AS[TableName],'CREATE INDEX [IX_'+ OBJECT_NAME(dm_mid.OBJECT_ID,dm_mid.database_id) + '_'+ REPLACE(REPLACE(REPLACE(ISNULL(dm_mid.equality_columns,''),', ','_'),'[',''),']','') + CASEWHENdm_mid.equality_columns ISNOTNULLANDdm_mid.inequality_columns ISNOTNULLTHEN'_'ELSE''END+ REPLACE(REPLACE(REPLACE(ISNULL(dm_mid.inequality_columns,''),', ','_'),'[',''),']','')+ ']'+ ' ON '+ dm_mid.statement+ ' ('+ ISNULL(dm_mid.equality_columns,'')+ CASEWHENdm_mid.equality_columns ISNOTNULLANDdm_mid.inequality_columns ISNOTNULLTHEN','ELSE''END+ ISNULL(dm_mid.inequality_columns, '')+ ')'+ ISNULL(' INCLUDE ('+ dm_mid.included_columns + ')', '') ASCreate_StatementFROMsys.dm_db_missing_index_groups dm_migINNERJOINsys.dm_db_missing_index_group_stats dm_migsONdm_migs.group_handle = dm_mig.index_group_handleINNERJOINsys.dm_db_missing_index_details dm_midONdm_mig.index_handle = dm_mid.index_handleWHEREdm_mid.database_ID = DB_ID()ORDERBYAvg_Estimated_Impact DESCGO