Re: Poor performance after moving Extempore database from 7.3.4 to 8.1.7

Yes it does. 8i has parameters optimizer_index_cost_adj and optimizer_index_caching, which don't exist in 7.3. And these parameters' default values aren't optimal.

Also, when testing your app, be sure that you're comparing oranges with oranges, e.g. if your app uses bind variables but your sqlplus test doesn't, the comparision is quite pointless...

Tanel.

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Monday, August 11, 2003 11:24 PM 8.1.7

> The old and new versions were both set to CHOOSE. Both are analyzed.
> Are you saying 8.1.7 handles this differently?
>
> Thanks!
> Ron
>
> -----Original Message-----
> Sent: Monday, August 11, 2003 3:04 PM
> To: Multiple recipients of list ORACLE-L
> to 8.1.7
>
>
> RBO, CBO, the old story. If you plan to continue using 8.1.7 for a
> While, then set the parameter OPTIMIZER_MODE to RULE. Your performance
> will be normal again and programmers will be able to override the
> parameter By specifying any hint except /*+ RULE */. Before switching to
> CBO, please read the article about the intelligent life in the
> optimizer. The article
> itself is a good one (thanks, Tim) but reading the book from JL
> (Jonathan
> Lewis, not Jeniffer Lopez) wouldn't hurt, either.
>
> --
> Mladen Gogala
> Oracle DBA
>
>
>
> -----Original Message-----
> Smith, Ron L.
> Sent: Monday, August 11, 2003 3:14 PM
> To: Multiple recipients of list ORACLE-L
> 8.1.7
>
>
>
> We recently upgraded an application (Extempore) database from Oracle
> 7.3.4 to 8.1.7. The clients say the test database, still on Oracle
> 7.3.4 is much faster than the production database, now on 8.1.7. The
> server is newer and faster on the production database. The Oracle init
> parameters are pretty much identical.
>
> When I access the database through SQL*PLUS or TOAD, the response is
> instantaneous. The app uses an ODBC connection which is also 8.1.7. I
> have tried attaching the tables in MS Access through ODBC. This too is
> instantaneous.
>
> Any ideas?
>
> Ron Smith
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Smith, Ron L.
> INET: rlsmith_at_kmg.com
>
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Tanel Poder
  INET: tanel.poder.003_at_mail.ee

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