Date: Thu, 28 Jun 2007 21:34:05 -0400
From: Alvaro Herrera <alvherre@commandprompt.com>
To: Bruce Momjian <bruce@momjian.us>
Cc: David Gardner <david@gardnerit.net>, pgsql-docs@postgresql.org
Subject: Re: proposed FAQ entry
Message-ID: <20070629013405.GJ32626@alvh.no-ip.org>
References: <467C6DD9.3090407@gardnerit.net>
	<200706290106.l5T16KU18798@momjian.us>
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Bruce Momjian wrote:
> David Gardner wrote:
> > Earlier today I was tempted to start storing usesysid's as foreign keys 
> > in one of my tables by doing:
> > SELECT usesysid FROM pg_user WHERE pg_user.usename= user;
> > 
> > My proposed FAQ entry is based on this mailing list post which convinced 
> > me not to:
> > http://archives.postgresql.org/pgsql-novice/2005-04/msg00328.php
> > 
> > 
> > So the Question would be:
> > 
> > Q) How do I keep track of edits to a table? OR Can I use store usesysid 
> > in my table to identify users?
> > 
> > A) No because usesysid values are not guaranteed to remain the same 
> > after a restore, or upgrade. Instead store the user name as text, if 
> > needed create your own user table and associate the user names with 
> > integer keys.
> 
> Uh, sorry, this is not a _frequent_ question/issue.

Hmm, I do see it from time to time in pgsql-es-ayuda.  Maybe not as
frequently as some other questions that are also missing from the FAQ
(like a thorough explanation of encoding issues), but I digress.

-- 
Alvaro Herrera                               http://www.PlanetPostgreSQL.org/
"Ni aun el genio muy grande llegaría muy lejos
si tuviera que sacarlo todo de su propio interior" (Goethe)