1. The linux versions are certified.
2. Oracle 12c is not certified with 951. 12c is supported starting from 961
Just to clarify point 1.
Both the linux versions ie 6.5 and 6.6 are certified.
And the version 9.6.1 is certified for RHEL 6.5 and 6.6? There's a document about it?
You will also find the details related to database support for the Domain in the PAM. You can get the PAM from Informatica Network and verify the sup-portability details.