Upgrades are usually complex, especially if you have a non-standard configuration -- and it sounds like you have a shared Oracle database that may not be located on the CMOD server -- two things that will make it more complex, because it's not really a configuration that IBM recommends, even though it's supported.
You'll need to assemble your team and find out who on your team can help you with the Oracle upgrade component, and if that person is you, then you need to read the documentation and practice the upgrades in your other regions (Dev, Test, UAT, QA, and Prod) so that you can give us the details we need (What did you try, what happened, and how did it differ from your expectations, what were the error messages, etc.) so that we can better help you.
-JD.
