RE: Huge optimization costs with 9.2

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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