Jira and PostgreSQL

Hello all,
Has any one worked with Jira on PostgreSQL?
We are considering Jira implementation for our organization (about 1500
users).
The question is - "Jira on MySQL or Jira on PostgreSQL?" Any
tips/suggestions are welcome. We do not have much expertise in either of
these databases.
Oracle, the database we have expertise in, cannot be considered because of
the license costs :)

Regards,
Jayadevan

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