Only 12c is supported per https://confluence.atlassian.com/adminjiraserver074/supported-platforms-881683157.html
Even if it works on 11, I would not risk it.
Also, PostgreSQL tends to have a lot more burn in than any other DB due to it's broad internal use at Atlassian. I recommend it to most of my clients, as long as they have staff who can support it (or they're equaly not qualified to support any of the supported DBs).
Hey Community mates! Claire here from the Software Product Marketing team. We all know software development changes rapidly, and it's often tough to keep up. But from our research, we've found the h...
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