RE: why rule based optimizer performs better than cost based?
- From: "Guang Mei" <gmei@xxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 25 Jun 2004 11:57:23 -0400
Dick,
Thanks. After I set the parameters in the session to 90 and 50:
MT@max-SQL> select name,value from v$parameter where name like
'optimizer_index%';
NAME
----------------------------------------------------------------
VALUE
----------------------------------------------------------------------------
----
optimizer_index_cost_adj
50
optimizer_index_caching
90
The cost based query's explain plan now is the same as rule based. This
means it does use index.
Guang
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