Re: Tuning 9i Database - after migrating from 8i. -
- From: "Juan Cachito Reyes Pacheco" <jreyes@xxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 4 Mar 2004 16:13:28 -0400
you have to test what is the best for you,
read
http://www.evdbt.com/SearchIntelligenceCBO.doc
----- Original Message -----
From: "Wolfgang Breitling" <breitliw@xxxxxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Thursday, March 04, 2004 3:23 PM
Subject: Re: Tuning 9i Database - after migrating from 8i. -
> I have to admit that I am not a fan of changing them from their default
> values. In the databases I am, or have been, working with (Peoplesoft),
> changing them usually induces too many NL joins with disastrous
consequences.
>
> In Oracle 9i I would investigate the use of dbms_stats.gather_system_stats
> prior to attempting to tweak the O_I_C.. parameters. Joze Senegacnik
> reports good success with it. I myself do not have experience with 9i in a
> large enough production setting to say.
>
> At 10:32 AM 3/4/2004, you wrote:
>
> >I am trying to determine if setting the two spfile parameters
> >"optimizer_index_caching" and "optimizer_index_cost_adj" to values of
> >other than the default does actually enhance or degrade the SQL queries.
> >
> >So my questions are
> >1. Do you set these parameters ??
> >2. If you do what values work for you ??
> >3. What do you do in a case where it works for most but not for all of
> >your SQL??
> >
> >TIA.
> >
> >Yuval.
>
> Wolfgang Breitling
> Oracle7, 8, 8i, 9i OCP DBA
> Centrex Consulting Corporation
> http://www.centrexcc.com
>
>
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