Received: from maia.hub.org (unknown [200.46.204.183]) by mail.postgresql.org (Postfix) with ESMTP id 5C0F1638165 for ; Tue, 2 Feb 2010 14:52:20 -0400 (AST) Received: from mail.postgresql.org ([200.46.204.86]) by maia.hub.org (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 10058-03-4 for ; Tue, 2 Feb 2010 18:52:07 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mail-fx0-f225.google.com (mail-fx0-f225.google.com [209.85.220.225]) by mail.postgresql.org (Postfix) with ESMTP id 6DDE565A333 for ; Tue, 2 Feb 2010 14:19:24 -0400 (AST) Received: by fxm25 with SMTP id 25so402847fxm.34 for ; Tue, 02 Feb 2010 10:19:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=QX8sDKhljEW92Lu+nq3hKYPtg5I31ov3zoJatqglI9E=; b=wT7JIIlGDbNxB0JIXZqNeEQFJohGXNsNdYlu4o3BQcLACbFmVGH3HhEB8SPCblbbjz GAbelG2R2QmOLeunQluc9eRvqneLewg6Qpd7sMNO+wQerDcpDHxPLgVkGJ6px43t0wKh MNixXuDU8RdFyiTXbrm3fnbZ1K8mI8jW29/Xo= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=enZqQKrtz54ExBt8nyDpPdYrr0BnM5T7P7dsnA8xN1xewnSiZ3X/JhTpA8/3cduYsg K65ayj0Y2H+mf4a6FKHetHBOjMDFCkn21iGC2ACe2Pm3ybfsBrmvu3a4sFmaHbsd3n8U cQ5XAjaKl2Qj2bU4SjPxDmSGTSJA7PE8zzr94= MIME-Version: 1.0 Received: by 10.216.90.196 with SMTP id e46mr797782wef.194.1265128046397; Tue, 02 Feb 2010 08:27:26 -0800 (PST) In-Reply-To: <20100202162046.GA4020@alvh.no-ip.org> References: <20100202045701.93A404B1C73@mail175-236.sinamail.sina.com.cn> <20100202162046.GA4020@alvh.no-ip.org> Date: Tue, 2 Feb 2010 09:27:26 -0700 Message-ID: Subject: Re: the jokes for pg concurrency write performance From: Scott Marlowe To: Alvaro Herrera Cc: wyx6fox@sina.com, pgsql-performance@postgresql.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=-1.11 tagged_above=-10 required=5 tests=BAYES_05=-1.11 X-Spam-Level: X-Archive-Number: 201002/17 X-Sequence-Number: 37438 On Tue, Feb 2, 2010 at 9:20 AM, Alvaro Herrera wrote: > Scott Marlowe escribi=F3: >> 2010/2/1 =A0: > >> Let's rewrite this assertion: >> > * joke 1: insert operation would use a excluse lock on reference row b= y the >> > foreign key . a big big big performance killer , i think this is a stu= pid >> > design . >> >> "problem #1: insert operation would use a excluse lock on reference row = by the >> foreign key . a big big big performance killer. =A0" > > Yeah, if it had been written this way I could have told him that this > is not the case since 8.1, but since he didn't, I simply skipped his > emails. I wonder if having paid technical support to abuse leads to people thinking they can treat other people like crap and get the answer they want anyway... Well, we'll see if the OP can write a non-flame-filled inquiry on their performance issues or not.