RE: hinting and the rule based optimizer
- From: DENNIS WILLIAMS <DWILLIAMS@xxxxxxxxxxxxx>
- To: "'oracle-l@xxxxxxxxxxxxx'" <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 1 Apr 2004 14:10:19 -0600
Ryan
Use the RULE hint.
Dennis Williams
DBA
Lifetouch, Inc.
dwilliams@xxxxxxxxxxxxx
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of ryan.gaffuri@xxxxxxx
Sent: Thursday, April 01, 2004 2:04 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: hinting and the rule based optimizer
We have a legacy 8.1.7.3 instance that is in RBO mode. My group does not own
it, so we cannot change it to CBO.
When I hint anything from an index to ordered, etc... it switches to the CBO
and since nothing is analyzed, it's an even worse plan... Not allowed to
analyze the tables either because it's not our property.
Any rules around hinting the RBO in 8.1.7.3? Why would it switch to the CBO
from a simple hint? I never use the RBO so please bare with me.
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