RE: oica/oic
- From: Wolfgang Breitling <breitliw@xxxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Mon, 19 Apr 2004 13:22:18 -0600
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
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