Re: Oracle, Siebel and rule-based optimization

From: Jared Still <jkstill_at_cybcon.com>
Date: Fri, 31 Jan 2003 18:18:50 -0800
Message-ID: <F001.0054148C.20030131181850@fatcity.com>

On Friday 31 January 2003 07:09, Michael Fontana wrote:

>

> Still, some of the queries in Siebel SEEM to run better using CBO. Is
> there any way to mix and match approaches? To use RBO by default, but
> perhaps CBO might make sense for certain queries, and perhaps some
> AD-HOC?
The problem with using CBO for 'some' queries is that analyzing a table turns on CBO for every query the table is used in, not just the ones you wish.

Tony's approach sounds interesting enough to make me start playing with plan stabilility. Like I don't have enough to do. :)

Jared

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Author: Jared Still
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Received on Fri Jan 31 2003 - 20:18:50 CST