Re: optimizer settings
- From: "K Gopalakrishnan" <kaygopal@xxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 1 Mar 2004 20:27:55 +0530
Jaffar:
They are the default settings on 9i. You may not need to tweak the max
permutations
unless you have more than 7-8 tables in where condition. However you can
reduce the
optimizer_index_cost _adj after some analysis on single block read to
multiblock read
timings. You can find 'Search for Intelligence in CBO' paper by Tim Gorman
in his
site www.evdbt.com
Regards,
Gopal
----- Original Message -----
From: "Syed Jaffar Hussain" <sjaffarhussain@xxxxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Monday, March 01, 2004 8:12 PM
Subject: optimizer settings
> Hi List,
>
> After installing oracle 9.2.0.1 on HPUX 11i bit 64, I found the following
> optimizer settings
>
> optimizer_index_cost_adj integer 100
> optimizer_max_permutations integer 2000
>
> Are these parameters set by default to match most of the system
requirments
> or do we need to change it?
>
> Rgds
> Jaffar
>
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