X-Original-To: pgsql-sql-postgresql.org@postgresql.org Received: from localhost (wm.hub.org [200.46.204.128]) by postgresql.org (Postfix) with ESMTP id 7731A9FB28F for ; Mon, 28 Aug 2006 07:46:23 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.128]) (amavisd-new, port 10024) with ESMTP id 09501-07 for ; Mon, 28 Aug 2006 10:46:14 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey- Received: from main2.mycybernet.net (main2.mycybernet.net [209.222.63.140]) by postgresql.org (Postfix) with ESMTP id 5FEDB9FCE47 for ; Mon, 28 Aug 2006 07:46:14 -0300 (ADT) Received: from 227-54-222-209.mycybernet.net ([209.222.54.227] helo=phlogiston.dydns.org) by main2.mycybernet.net with esmtp (Exim 4.62) (envelope-from ) id 1GHeqo-00018A-RB for pgsql-sql@postgresql.org; Mon, 28 Aug 2006 07:00:18 -0400 Received: by phlogiston.dydns.org (Postfix, from userid 1000) id 8DD5F417B; Mon, 28 Aug 2006 06:46:03 -0400 (EDT) Date: Mon, 28 Aug 2006 06:46:03 -0400 From: Andrew Sullivan To: pgsql-sql@postgresql.org Subject: Re: Create Assertion -- Question from a newbie Message-ID: <20060828104603.GA2492@phlogiston.dyndns.org> References: <20060827135437.GA1869@wolff.to> <20060827143949.16261.qmail@web31812.mail.mud.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060827143949.16261.qmail@web31812.mail.mud.yahoo.com> User-Agent: Mutt/1.5.9i X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=0.135 tagged_above=0 required=5 tests=FORGED_RCVD_HELO X-Spam-Level: X-Archive-Number: 200608/214 X-Sequence-Number: 26172 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. A -- Andrew Sullivan | ajs@crankycanuck.ca This work was visionary and imaginative, and goes to show that visionary and imaginative work need not end up well. --Dennis Ritchie