RE: why rule based optimizer performs better than cost based?

From: Guang Mei <gmei_at_incyte.com>
Date: Fri, 25 Jun 2004 11:57:23 -0400
Message-ID: <NJEDKDKJDGAKAEKKNEEJIEKDDFAA.gmei@incyte.com>

Dick,

Thanks. After I set the parameters in the session to 90 and 50:

MT_at_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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Received on Fri Jun 25 2004 - 10:56:08 CDT