To: frank@joerdens.de, pgsql-sql@postgresql.org
Subject: Re: can you change an FK constraint from NOT DEFERRABLE to DEFERRABLE
References: <20050330090732.GA10376@mail.archi-me-des.de>
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From: PFC <lists@boutiquenumerique.com>
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Date: Wed, 30 Mar 2005 11:48:31 +0200
In-Reply-To: <20050330090732.GA10376@mail.archi-me-des.de>
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	Checks the docs on ALTER TABLE ... ALTER CONSTRAINT ...


On Wed, 30 Mar 2005 11:07:32 +0200, <frank@joerdens.de> wrote:

> Hello. Is it possible to change an FK constraint from NOT DEFERRABLE
> (the default) to DEFERRABLE without dropping and re-creating it? One idea
> that came up was to create a parallel set of constraints which perform
> the same checks as the existing ones as DEFERRABLE (and then drop the
> old set), but the objection there was that it'd lock the tables during
> the initial check.
>
> We're having a fairly serious deadlock issue and the thinking goes that
> Tom's suggestion here
>
> http://www.webservertalk.com/archive139-2004-8-364172.html
>
> to defer FK checks until transaction commit would maybe help. Right now
> we can't try this because all the FK checks where created with default
> settings. We'd like to avoid taking the database down for recreating
> foreign keys.
>
> Regards,
>
> Frank
>
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