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Message Posted: Fri, 28 Jun 2002 @ 23:55:17 GMT

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Subj:   Re: Anyone noticing increased spool usage under V2R412?
From:   Dennis Calkins


please report this to the GSC. Please encapsulate your query within a TSET export so that the GSC can check to see if the PLAN has changed bewteen 4.1.0 and 4.1.2.

Typically if it using more spool the optimizer has chosen a different path for some reason and we should figure out the reason.

Maybe it is out of date statitics.

Maybe you added more records to one of tables and crossed a boundary where the optimizer chooses a merge join vs a hash join vs cartesian product.

Maybe a DR added to 4.1.2 changed the boundary value and therefore without adding any more records your query is now on the other side of that boundary.

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