RE: Oracle 10g upgrade - performance issue

I would suggest following "Method R", i.e. tuning for response time, starting with your most business critical functions, by running a 10046 trace and finding out where it's spending the majority of it's time, then tune from there. If you're using the Diagnostics & Tuning packs in the 10g console, it should be easy to quickly identify the SQL statements hogging the most resources and run the tuning advisor on them to see if it comes up with any gems of wisdom.

Maybe your SGA is undersized - did you increase it significantly with the upgrade from 8i to 10g? If not, you probably need to - unless it was oversized to begin with.

What does your OS show as consuming the most CPU and disk time - did you confirm it is Oracle that is hogging it or could there be something else running on the system?

Regards,
Brandon

-----Original Message-----

From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Peter Dixon Sent: Tuesday, July 11, 2006 10:43 AM
To: oracle-l_at_freelists.org
Subject: Oracle 10g upgrade - performance issue

Help!

Upgraded 8.1.7.4 to 10g rel 2 smoothly over the weekend. Batch works fine, but OLTP is causing CPU and disk i/o to max out at 100%, i believe the optimiser is making bad decisions as my introducing rule hints the problem has slightly improved. Any ideas as our SR with Oracle says "tune the code"
also we never got the issues in test.

Peter Dixon

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http://www.freelists.org/webpage/oracle-l Received on Tue Jul 11 2006 - 13:03:34 CDT