RE: oica/oic

From: Wolfgang Breitling <breitliw_at_centrexcc.com>
Date: Mon, 19 Apr 2004 13:22:18 -0600
Message-Id: <6.0.3.0.2.20040419132136.026b3da8@pop.centrexcc.com>

Changing O_I_C_A to lower than the default 100 will NOT make nested loops and sb_file_sequential reads go faster. What it potentially, and most likely, will do is make the optimizer use MORE nested loops and db_file_sequential reads. that's what probably happened to some sql in your batch jobs.

At 11:46 AM 4/19/2004, you wrote:
>Changed because too many db file seq reads with nested loops! thinking =
>that these params makes faster access to retrieve table data!!
>
>-----Original Message-----
>
>Before I used to have default settings of below params, But I changed to
>=3D3D
>40(oica) and 90. But my 1/2hour batch job taking 2 1/2hrs extra time =
>=3D3D
>because of these params!! Is there any particular reason behind it? =
>=3D3D
>Instead of improving performance its decreased drastically, So how to =
>=3D
>=3D3D
>arrive optimal values for these two params? Mine is oracle8174 with =
>=3D3D
>AIX51.
regards

Wolfgang Breitling
Centrex Consulting Corporation
www.centrexcc.com

Please see the official ORACLE-L FAQ: http://www.orafaq.com

To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line.

--
Archives are at http://www.freelists.org/archives/oracle-l/
FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html
-----------------------------------------------------------------

Received on Mon Apr 19 2004 - 14:38:22 CDT