RE: Oracle 10g upgrade - performance issue
- From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
- To: <peterdixon001@xxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 11 Jul 2006 11:03:34 -0700
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@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Peter Dixon
Sent: Tuesday, July 11, 2006 10:43 AM
To: oracle-l@xxxxxxxxxxxxx
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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