X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (av.hub.org [200.46.204.144]) by svr1.postgresql.org (Postfix) with ESMTP id 4335D52AF7 for ; Thu, 18 Aug 2005 05:59:20 -0300 (ADT) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (av.hub.org [200.46.204.144]) (amavisd-new, port 10024) with ESMTP id 46818-05 for ; Thu, 18 Aug 2005 08:59:16 +0000 (GMT) Received: from floppy.pyrenet.fr (floppy.pyrenet.fr [194.116.145.2]) by svr1.postgresql.org (Postfix) with ESMTP id 4107352ABF for ; Thu, 18 Aug 2005 05:59:15 -0300 (ADT) Received: by floppy.pyrenet.fr (Postfix, from userid 106) id A75D930B42; Thu, 18 Aug 2005 11:10:30 +0200 (MET DST) From: "Qingqing Zhou" X-Newsgroups: pgsql.performance Subject: Re: Performance pb vs SQLServer. Date: Thu, 18 Aug 2005 16:56:41 +0800 Organization: Hub.Org Networking Services Lines: 16 Message-ID: References: <6BCB9D8A16AC4241919521715F4D8BCE6C789C@algol.sollentuna.se> <20050815161859.GB22386@alvh.no-ip.org> Reply-To: "Qingqing Zhou" X-Complaints-To: usenet@news.hub.org X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2800.1506 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506 To: pgsql-performance@postgresql.org X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Status: No, hits=1.185 required=5 tests=[AWL=-0.000, PRIORITY_NO_NAME=1.185] X-Spam-Level: * X-Archive-Number: 200508/226 X-Sequence-Number: 13973 "Alvaro Herrera" writes > > Interesting; do they use an overwriting storage manager like Oracle, or > a non-overwriting one like Postgres? > They call this MVCC "RLV(row level versioning)". I think they use rollback segment like Oracle (a.k.a "version store" or tempdb in SQL Server). Some details are explained in their white paper:"Database concurrency and row level versioning in SQL Server 2005". Regards, Qingqing