I saw a question about Ops Center's database license recently:
"Ops Center comes with a license for an Oracle Database. What if I want to set up multiple databases in a RAC? Is that covered by this license?"
The answer here is that Ops Center only comes with a license for a single instance of an Oracle Database. This can be either the embedded database or a single customer-managed database. If you want to set up multiple databases in a RAC for use by Ops Center, you'll need separate licenses for all but one of them.