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 6:20 am

    #1675117

    GilaMonster (12/20/2013)

    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orders of magnitude higher than the estimated number of rows, the statistics on the table being used in that node are out of date.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

    oh yes, i agree; but it's certainly something to watch for.

    Lowell

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