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Pl identify exact versions of "9i" and "11g" - there are plenty of changes between these versions. You will need to perform test upgrades and test all of your application/functionality to identify issues and their resolution.
I would recommend you read thru this document
Oracle 11gR2 Upgrade Companion [ID 785351.1]
925967 wrote:When all else fails Read The Fine Manual
Hello - We are planning to upgrade from 9i to 11g, Is there somewhere documented how the optimizer behaves and also any code changes that we can recommend to be changed for developers. It would be great for any suggestions.