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system_seeks, system_scans and system_lookups

  • February 18, 2010 at 5:46 am

    #215859

    How system_seeks, system_scans and system_lookups are different in sys.dm_db_index_usage_stats? This will inform me which index is least used and I shall think about removing that.

    -Lk

  • February 18, 2010 at 5:54 am

    #1120837

    What do you mean? How are they different from what?

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

    We walk in the dark places no others will enter
    We stand on the bridge and no one may pass

  • February 18, 2010 at 7:21 am

    #1120909

    luckysql.kinda (2/18/2010)

    How system_seeks, system_scans and system_lookups are different in sys.dm_db_index_usage_stats? This will inform me which index is least used and I shall think about removing that.

    -Lk

    Shouldn't you be looking at user seeks, scans, and lookups too?

    It's all detailed in Books Online: (hit F1!)

    sys.dm_db_index_usage_stats

    About the only thing that isn't clear from the documentation is that all KEY lookups are counted against the clustered index.

    Paul

    Paul White
    SQLPerformance.com
    SQLkiwi blog
    @SQL_Kiwi

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