Due to policies for Red Hat family distributions, the PostgreSQL installation will not be enabled for automatic start or have the database initialized automatically.
To which policies are they referring? Licensing, security, or other?​
Packaging policy: daemons shall not run merely by virtue of having been installed. Otherwise, if you install a boatload of software without checking each package, you'd have a boatload of probably-unwanted and possibly-incorrectly-configured daemons running. Which is a performance problem and likely a security hazard too.
It's a good policy IMO (though I used to work there so no doubt I've just drunk too much Red Hat koolaid).
Seems reasonable. In fact somewhat better than current KDE as in e.g. Debian "Jessie", which embeds a copy of MySQL whether the the user wants to use it or not.
Ubuntu 15 Desktop enables mysqld by default. In fact, it doesn't seem to hook up with systemd in any obvious way to disable autostart.
--Scott
-- Mark Morgan Lloyd markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]