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Re: Server Crash

From: "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com>
To: "Hajek, Nick" <Nick(dot)Hajek(at)vishay(dot)com>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: Server Crash
Date: 2008-04-22 15:13:09
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-admin
On Tue, Apr 22, 2008 at 8:14 AM, Hajek, Nick <Nick(dot)Hajek(at)vishay(dot)com> wrote:
> All,
> We experienced a crash of a Postgresql server which from the log appears to
> have began with this entry:
> Log:  background writer process (PID 3457) was terminated by signal 9

Kill -9 is the "shoot it in the head" signal.  It is not generated by
postgresql in normal operation.  It can be generated by "pg_ctl -m
immediate stop" .  At least I think that's what signal it sends.

Anyway, the most common cause of kill -9s randomly showing up in linux
is the OOM killer.

It's quite possible you're running your machine out of memory / swap
somehow and linux is killing the biggest, fattest process it can find,
which is pgsql.

you might wanna run vmstat 1 to see what's happening during these times.

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