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PostgreSQL upgrade

Hey Folks -
I apologize if this has been asked, but I couldn't find much on it when searching the email forums. Anyway, we currently have a CentOS 5.9 system running PostgreSQL 8.4 and OpenClinica 3.1.2. We are preparing to upgrade PostgreSQL to either 9.0, or more likely 9.1, and possibly upgrading to CentOS 6.4 at the same time. I have 3 questions:
1. Does OC 3.1.2 run on PG 9.0/9.1?
2. Does OC 3.1.2 migrate from PG 8.4 to 9.0/9.1? Or are there hoops to jump through?
3. If we do decide to also upgrade OC, would it be better to upgrade before upgrading the OS and PG? Or after?
Thanks folks!
-Brian
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