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).
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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