Home Forums SQL Server 2008 SQL Server 2008 Administration What to look for in Execution plans when a query is slow ? RE: What to look for in Execution plans when a query is slow ?

  • December 20, 2013 at 6:08 am

    #1675111

    Lowell (12/20/2013)

    » in an actual execution plan, for any node, if the actual number of rows is orders of magnitude higher than the estimated number of rows, the statistics on the table being used in that node are out of date.

    Not necessarily. There's a number of other reasons for cardinality estimates being wrong

    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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