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Message Posted: Wed, 05 Jan 2005 @ 11:42:15 GMT

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Subj:   Re: Effect of ORDER BY in performance
From:   Victor Sokovin

  When I looked into the EXPLAIN of the query with and without ORDER BY, the estimated time is shown same with high confidence (as the stats are rightly available). I was expecting the query with ORDER BY to give a longer time that the one without ORDER BY.  

  Any reason, why it wasn't that way..?  

I think it depends on the number of rows returned. If the sort occurs at the end of the query execution (you should probably see it in the plan) on a relatively small number of rows in the spool file (if there is any intermediate spool file involved at all) then the sort time is negligible.



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