RULE hint

From: Bala Regupathy <oramail_at_sbcglobal.net>
Date: Wed, 09 Jul 2003 12:45:57 -0700
Message-ID: <F001.005C41B7.20030709123931@fatcity.com>

Few sql queries run fast (less than a second) when I use RULE hint and without RULE hint it takes 30 seconds. The queries are not that complicated, but joins 10 - 12 tables. I compared the plans between RULE hint and witout RULE hint, they are almost the same except join methods. Also, I checked the trace with 10046 event, and found out that without RULE hint, the parsing takes almost 30 seconds (when I run the same query for the second/third time it takes less than a second). Our developers ruled out of using bind variables as the roguewave's SourcePro C++ (Edition 5) libraries have serious bugs when they use bind variables (Please let me know if some of your developers have any fixes for this). I'm able to tune most of the queries by re-writing using UNION/EXISTS/in-line-view etc and get them to less than a second, for the rest I'm pushing RULE hint to the developers. I hate to use any hints as they are not scalable between versions/OS/patches etc. Do you guys have any idea of reducing parsing time or any suggestions.

Current plantform :

Oracle 8.1.7.2.0
SunOS 5.8
Sun E10K

Thanks,

Bala.

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Author: Bala Regupathy
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