From: Alvaro Herrera <alvherre@commandprompt.com>
To: Flávio Suguimoto <flavio.suguimoto@pragyatechnologies.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Problems with disabling triggers in Postgres 7.3.9
Date: Thu, 9 Mar 2006 10:55:57 -0300
Message-ID: <20060309135557.GA5489@surnet.cl> (raw)
In-Reply-To: <HNEBJEEMBNKOOBGHINHKCECMCAAA.flavio.suguimoto@pragyatechnologies.com>
References: <HNEBJEEMBNKOOBGHINHKCECMCAAA.flavio.suguimoto@pragyatechnologies.com>
Flávio Suguimoto wrote:
> Hi all,
>
> I have a problem in a trigger that disable all the triggers of a table. This
> error occurs randomly and my guess is that occurs when i have a lot of
> concurrents inserts in the table participation.
>
> The error is : RelationBuildTriggers: 2 record(s) not found for rel
> participation
I don't know what's involved in this particular bug, but the short
answer is: don't update system catalogs directly. Have your triggers
cope with the situation where you don't want to fire them in certain
cases.
System catalogs are delicate stuff; there are some caches that must be
maintained in a coherent manner. Usually the catalogs do not follow
MVCC rules to the letter. The "UPDATE pg_class" was used by pg_dump at
some point, but it was only a hack and I wouldn't expect it to work
correctly when multiple processes are involved.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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To: pgsql-sql@postgresql.org
Cc: alvherre@commandprompt.com, flavio.suguimoto@pragyatechnologies.com
Subject: Re: Problems with disabling triggers in Postgres 7.3.9
In-Reply-To: <20060309135557.GA5489@surnet.cl>
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