Optimizer_feature greater that compatible

Hi,
I came across a database with optimizer_feature_enabled = 11.2.0.2 and compatible = 10.2.0.4
Will this even work?
When I've ever used optimizer_feature_enabled I've always had compatible greater then optimizer_feature_enabled.
The reason why I ask this question is that I have two test databases witch is configured differently one with compatible and optimizer_feature_enabled the same and one with optimizer_feature_enabled greater then compatible. There has been reports of better performence on the database with lower compatible.
Regards

>
I came across a database with optimizer_feature_enabled = 11.2.0.2 and compatible = 10.2.0.4
Will this even work?
>
As Srini said - yes - it will work.
Whether you want to have this mismatch depends on your use case.
You may now (with 11.2.0.2) be using optimization that isn't available in the 10.2 version and that can be good or bad depending on the queries that you use.
When a database is upgraded the 'optimizer_feature_enabled' parameter will default to the value for the new DB version. Many organizations will perform an upgrade but use settings for both parameters for the older DB version to try to minimize unexpected issues and problems.
Then when things seem to run ok the 'compatible' flag will be changed to the new DB version and they will be looking for any problems that are introduced by doing that.
The same thing applies to the optimizer parameter. Whenever you change either parameter you should have a 'rollback' plan in place in case unexpected issues arise. That means only changing them after you have a known, good backup for recovery.

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