When to change COMPATIBLE parameter while upgrading to Oracle 11G

We are planning to upgrade from Oracle 10.2.0.4 on AIX to Oracle 11.2.0.2 soon.
While reading oracle upgrade documents and from oracle upgrade blog, it is mentioned that once we change compatible parameter,
we will not be able to catdwgrd.sql to downgrade.
However, if we don't change compatible parameter after an upgrade, all the testing efforts during upgrade process wont be complete
as we may need to do another round of testing after changing this value.
So what is the best time for changing this compatible parameter? 1 week or 2 weeks after upgrade?
We are considering catdwgrd.sql as our option to fallback if something goes wrong.
Thank You
Sarayu

Hi,
It's a difficult question. If your applications are validated with 11gR2, if your OS is certified to work with Oracle 11gR2, if you adjusted the requirements etc. it will work. Will it work 100% well ? Maybe not but downgrading is really an extreme solution. 11gR2 is a fully supported version and anyway you will obtain efficient support from Oracle if you encountered a bug etc.
If you have doubts change when you are sure every critical activity/charge you expect went well for example. We cannot know if it will be after 1 week or 2 weeks : it's up to you.
Be sure you check what Tom says about the COMPATIBLE parameter (it's interesting to know exactly what it covers, it does not cover the optimizer features etc.) : http://asktom.oracle.com/pls/apex/f?p=100:11:0::::P11_QUESTION_ID:485421569569
Best regards
Phil

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