FreeLists / oracle-l / Re: optimizer settings

["K Gopalakrishnan" <kaygopal@xxxxxxxxx>]

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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