RE: Pinning/keeping plans in shared pool

Excellent summary Ramick - thank you. One more thing to add is that when I ran the query manually with a RULE hint, the performance was excellent, so one of the workarounds I plan to test is using dbms_advanced_rewrite to rewrite the query with a RULE hint.

Yes, there are certainly histograms involved here since I'm running the gather_stats_job, so I think I will take your advice and try removing all the histograms (by running gather_table_stats with method_opt=>'FOR ALL COLUMNS SIZE 1') and see if that makes a significant difference in the parse time.

I did run a 10053 trace on it, but it is 35MB (3MB gzipped) so probably not appropriate for posting on the list, but I will send you (and anyone else interested) a zipped copy privately.

Thanks,
Brandon

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of ramick

So, you're at 10.2.0.2 on AIX 5.3 from 8.0.6. You have a couple of queries joining 20+ tables which performs OK on 806 and has a very long parse time with 10gR2.

Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.

--
http://www.freelists.org/webpage/oracle-l