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Huom: Tämä artikkeli käsittelee edistyneempiä optimointeja SQL Server tietokannassa, joita ei normaaliolosuhteissa ole tarpeen tehdä.
Huom: Älä luota tämän skriptin tuottamaan tietoon sokeasti. Liiallinen indeksien luontikaan ei ole hyvästä.
SQL Server keeps track of the indexes that it thinks you should create that will help in improving the performance of queries. The following query list all missing indexes.
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