From: Alvaro Herrera <alvherre@commandprompt.com>
To: Andrew Sullivan <ajs@crankycanuck.ca>
Cc: pgsql-sql@postgresql.org
Subject: Re: Create Assertion -- Question from a newbie
Date: Mon, 28 Aug 2006 10:27:31 -0400
Message-ID: <20060828142731.GF27526@alvh.no-ip.org> (raw)
In-Reply-To: <20060828104603.GA2492@phlogiston.dyndns.org>
References: <20060827135437.GA1869@wolff.to>
<20060827143949.16261.qmail@web31812.mail.mud.yahoo.com>
<20060828104603.GA2492@phlogiston.dyndns.org>
Andrew Sullivan wrote:
> On Sun, Aug 27, 2006 at 07:39:49AM -0700, Richard Broersma Jr wrote:
>
> > Ah, I see. So the points is that checking the integrity between
> > two complete data sets can become a preformace killer.
>
> Not necessarily. More exactly, building a support system that can
> check such integrity in a completely general way, such that it could
> be used for any arbitrary data, is a hard problem that might destroy
> performance. It's also a pretty exotic feature. You might want to
> ask on the -hackers list for more detail, though.
Well, it's on the SQL standard, so we should look forward to
implementing (some form of) it some day.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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To: pgsql-sql@postgresql.org
Cc: alvherre@commandprompt.com, ajs@crankycanuck.ca
Subject: Re: Create Assertion -- Question from a newbie
In-Reply-To: <20060828142731.GF27526@alvh.no-ip.org>
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