RE: oica/oic
- From: "Raghu Kota (WBTQ)" <RKota@xxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 20 Apr 2004 09:38:09 -0400
Sounds reasonable!! that's what Cary said don't do anything with little =
knowledge!! Thanks to all.
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]
Sent: Monday, April 19, 2004 3:22 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: RE: oica/oic
Changing O_I_C_A to lower than the default 100 will NOT make nested =
loops=20
and sb_file_sequential reads go faster. What it potentially, and most=20
likely, will do is make the optimizer use MORE nested loops and=20
db_file_sequential reads. that's what probably happened to some sql in =
your=20
batch jobs.
At 11:46 AM 4/19/2004, you wrote:
>Changed because too many db file seq reads with nested loops! thinking =
=3D
>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
>=3D3D3D
>40(oica) and 90. But my 1/2hour batch job taking 2 1/2hrs extra time =
=3D
>=3D3D3D
>because of these params!! Is there any particular reason behind it? =3D
>=3D3D3D
>Instead of improving performance its decreased drastically, So how to =
=3D
>=3D3D
>=3D3D3D
>arrive optimal values for these two params? Mine is oracle8174 with =3D
>=3D3D3D
>AIX51.
regards
Wolfgang Breitling
Centrex Consulting Corporation
www.centrexcc.com=20
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