Why don't you try using a leading or ordered hint to get oracle to use the
smaller table first?
>From: Paula_Stankus_at_doh.state.fl.us
>Reply-To: ORACLE-L_at_fatcity.com
>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
>Subject: RE: why so much slower
>Date: Wed, 05 Jun 2002 12:18:45 -0800
>
>more info. It seemed just when I went from two to three tables in a join
>there was a very substantial increase in elapsed time. I did join with one
>large table and small codetable alone and performed like a champ. Hmmmm.
>Any ideas?
>
>-----Original Message-----
>Sent: Wednesday, June 05, 2002 3:03 PM
>To: 'ORACLE-L_at_fatcity.com'
>
>
>
>Set sort_area_size to very large as 20Gb (obscene) amount of space
>available.
>Doing 2 large table outer joins returns results in .341 seconds - both
>partitioned on same criteria
>added one small codetable equijoin with one of the larger tables. There is
>a foreign key to codetable and index that is unique.
>Used hash join hint
>Used nested loop hint
>
>Basically saw two large joins sort merged hash join then nested join to
>smaller table - much much smaller codetable.
>
>NO matter what it seems query is much much slower - Any ideas?
>
>
>
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Received on Wed Jun 05 2002 - 18:18:32 CDT
