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  • 索引建议

    SELECT TOP 10
            database_name = DB_NAME(details.database_id) ,
            schema_name = SCHEMA_NAME(tb.schema_id) ,
            object_name = tb.name ,
            avg_estimated_impact = dm_migs.avg_user_impact * ( dm_migs.user_seeks
                                                               + dm_migs.user_scans ) ,
            last_user_seek = dm_migs.last_user_seek ,
            create_index = 'CREATE INDEX [IX_' + OBJECT_NAME(details.object_id,
                                                             details.database_id)
            + '_' + REPLACE(REPLACE(REPLACE(ISNULL(details.equality_columns, ''),
                                            ', ', '_'), '[', ''), ']', '')
            + CASE WHEN details.equality_columns IS NOT NULL
                        AND details.inequality_columns IS NOT NULL THEN '_'
                   ELSE ''
              END + REPLACE(REPLACE(REPLACE(ISNULL(details.inequality_columns, ''),
                                            ', ', '_'), '[', ''), ']', '') + ']'
            + ' ON ' + details.statement + ' (' + ISNULL(details.equality_columns,
                                                         '')
            + CASE WHEN details.equality_columns IS NOT NULL
                        AND details.inequality_columns IS NOT NULL THEN ','
                   ELSE ''
              END + ISNULL(details.inequality_columns, '') + ')'
            + ISNULL(' INCLUDE (' + details.included_columns + ')', '')
    FROM    sys.dm_db_missing_index_groups AS dm_mig WITH ( NOLOCK )
            INNER JOIN sys.dm_db_missing_index_group_stats AS dm_migs WITH ( NOLOCK ) ON dm_migs.group_handle = dm_mig.index_group_handle
            INNER JOIN sys.dm_db_missing_index_details AS details WITH ( NOLOCK ) ON dm_mig.index_handle = details.index_handle
            INNER JOIN sys.tables AS tb WITH ( NOLOCK ) ON details.object_id = tb.object_id
    WHERE   details.database_id = DB_ID()
    ORDER BY avg_estimated_impact DESC;
    GO
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  • 原文地址:https://www.cnblogs.com/myloveblogs/p/13151429.html
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