X-Original-To: pgsql-performance-postgresql.org@postgresql.org Received: from localhost (wm.hub.org [200.46.204.128]) by postgresql.org (Postfix) with ESMTP id E06929FB2D2 for ; Mon, 4 Sep 2006 19:38:36 -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 06606-08 for ; Mon, 4 Sep 2006 22:38:34 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey- Received: from stark.xeocode.com (stark.xeocode.com [216.58.44.227]) by postgresql.org (Postfix) with ESMTP id E0C239FB2D1 for ; Mon, 4 Sep 2006 19:38:33 -0300 (ADT) Received: from localhost ([127.0.0.1] helo=stark.xeocode.com) by stark.xeocode.com with smtp (Exim 3.36 #1 (Debian)) id 1GKMhD-0001qr-00; Mon, 04 Sep 2006 18:13:35 -0400 To: Tom Lane Cc: Matteo Sgalaberni , pgsql-performance@postgresql.org Subject: Re: database bloat, non removovable rows, slow query etc... [RESOLVED] References: <20060901123915.GT2266@sgala.com> <4027.1157121810@sss.pgh.pa.us> <20060901172829.GX2266@sgala.com> <12756.1157132120@sss.pgh.pa.us> <20060902083725.GB2266@sgala.com> <2191.1157206883@sss.pgh.pa.us> From: Gregory Stark In-Reply-To: <2191.1157206883@sss.pgh.pa.us> User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.4 Date: 04 Sep 2006 18:13:34 -0400 Message-ID: <87ejur1drl.fsf@stark.xeocode.com> Lines: 15 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Virus-Scanned: Maia Mailguard 1.0.1 X-Spam-Status: No, hits=1.384 tagged_above=0 required=5 tests=SPF_SOFTFAIL X-Spam-Level: * X-Archive-Number: 200609/24 X-Sequence-Number: 20710 Tom Lane writes: > Matteo Sgalaberni writes: > > Good to know this...but why this behaviour? it'is lovely...:) > > Open transactions are tracked across the whole cluster. This is > necessary when vacuuming shared catalogs. In principle we could > track per-database xmin values as well, but the distributed overhead > that'd be added to *every* GetSnapshotData call is a bit worrisome. Don't we do that now in CVS (ie, in 8.2)? -- Gregory Stark EnterpriseDB http://www.enterprisedb.com