Re: Huge optimization costs with 9.2

Yes, they are same. Basically I didn't change any parameter after upgrade.

Guang Mei wrote:
>
> Hi Joan:
>
> Is your "hash_area_size" parameter the same in both situations?
>
> Guang
>
> -----Original Message-----
> Joan Hsieh
> Sent: Wednesday, October 01, 2003 11:55 AM
> To: Multiple recipients of list ORACLE-L
>
> Kirti,
>
> I had upgraded a database from 8.1.7.4 to 9.2.0.4. Before the upgrade,
> performance is good. After upgrade, one query run time from 2 min to 12
> hours. Of course, I re-analyzed all tables and indexes. The explain plan
> changed from hash join to nested-loop. All the parameters are same. So I
> have to put optimized_feature_enable=8.1.7 to make run normal as usual.
> I hate to disable the new feature, but no choose.
>
> Joan
>
> Kirtikumar Deshpande wrote:
> >
> > Were tables/indexes anlayzed after the upgrade?
> >
> > - Kirti
> >
> > --- Jeff Landers <jlanders_at_convergys.com> wrote:
> > > Hello All
> > >
> > > Version & OS:
> > > Upgraded from 9.0.1.4 (Sun Solaris 2.8) to 9.2.0.3.
> > >
> > > Problem:
> > > We've captured the sql text and optimization plans for critical sql
> > > prior to upgrading to 9.2. After the upgrade we have noticed
> > > that the cost associated with every sql statement is now HUGE
> > > compared to its 9.0.1.4 counterpart. Per the statistics being captured
> > > via traces,
> > > these statement are noticeably slower per execution.
> > >
> > > Anyone experiencing/experienced the same problem with 9.2?
> > >
> > > Thank you in advance.
> > >
> > >
> >
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> Author: Joan Hsieh
> INET: joan.hsieh_at_tufts.edu
>
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> Author: Guang Mei
> INET: gmei_at_incyte.com
>
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-- 
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-- 
Author: Joan Hsieh
  INET: joan.hsieh_at_tufts.edu

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