From: | "Merlin Moncure" <mmoncure(at)gmail(dot)com> |
---|---|
To: | "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | "Sorin N(dot) Ciolofan" <ciolofan(at)ics(dot)forth(dot)gr>, pgsql-general(at)postgresql(dot)org, pgsql-admin(at)postgresql(dot)org, pgsql-performance(at)postgresql(dot)org |
Subject: | Re: [GENERAL] ERROR: out of shared memory |
Date: | 2007-03-27 13:06:38 |
Message-ID: | b42b73150703270606w6c6605fbt12e863c8c9ef6366@mail.gmail.com |
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On 3/26/07, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> "Sorin N. Ciolofan" <ciolofan(at)ics(dot)forth(dot)gr> writes:
> > I have to manage an application written in java which call another module
> > written in java which uses Postgre DBMS in a Linux environment. I'm new to
> > Postgres. The problem is that for large amounts of data the application
> > throws an:
> > org.postgresql.util.PSQLException: ERROR: out of shared memory
>
> AFAIK the only very likely way to cause that is to touch enough
> different tables in one transaction that you run out of lock entries.
> While you could postpone the problem by increasing the
> max_locks_per_transaction setting, I suspect there may be some basic
> application misdesign involved here. How many tables have you got?
or advisory locks...these are easy to spot. query pg_locks and look
for entries of locktype 'advisory'. I've already seen some apps in
the wild that use them, openads is one.
merlin
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