Home Forums SQL Server 2005 SQL Server 2005 Performance Tuning Why are user_lookups > 0 on Clustered Index? RE: Why are user_lookups > 0 on Clustered Index?

  • December 30, 2009 at 1:40 am

    #1097352

    That shows the lookup done to the clustered index. So whenever a NC index is not covering and there's a key lookup, that's a lookup to the clustered index.

    As far as I'm aware, user_lookups will only be > 0 for clustered indexes (key lookups) and heaps (rid lookups)

    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

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