Re: Running both PG 8 and PG 9

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Bastiaan Olij <bastiaan(at)basenlily(dot)me>
Cc: pgsql Novice <pgsql-novice(at)postgresql(dot)org>
Subject: Re: Running both PG 8 and PG 9
Date: 2011-03-22 22:29:24
Message-ID: 8628.1300832964@sss.pgh.pa.us
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Bastiaan Olij <bastiaan(at)basenlily(dot)me> writes:
> I just installed PG 9 on my Macbook (enterprisedb) just to start playing
> around with it. My Postgres 8.4 installation won't start now anymore, it
> is complaining about shared memory already being in use.

> Is it even possible to run PG 8 and PG 9 side by side? I was under the
> impression this was possible provided they listen on different ports?

Yes, it is, but the default SHMMAX on OS X is too small to allow
starting two postmasters at once. Crank up the shmem settings (see
our manual for details) and you should be fine.

regards, tom lane

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