X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (mx2.hub.org [200.46.204.254]) by postgresql.org (Postfix) with ESMTP id 8244C11F6964 for ; Tue, 18 Apr 2006 19:22:38 -0300 (ADT) X-Virus-Scanned: by amavisd-new at hub.org X-Spam-Score: -2.301 X-Spam-Level: X-Spam-Status: No, score=-2.301 required=5 tests=[AWL=0.300, BAYES_00=-2.599, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001] Received: from postgresql.org ([200.46.204.71]) by localhost (mx2.hub.org [200.46.204.254]) (amavisd-new, port 10024) with ESMTP id T1nSRd5nBWbX for ; Tue, 18 Apr 2006 19:22:32 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id BC70811F6B16 for ; Tue, 18 Apr 2006 19:22:30 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.13.6/8.13.6) with ESMTP id k3IMMRYB019389; Tue, 18 Apr 2006 18:22:27 -0400 (EDT) To: "Jim C. Nasby" cc: Markus Schaber , pgsql-performance@postgresql.org Subject: Re: merge>hash>loop In-reply-to: <20060418215238.GK49405@pervasive.com> References: <1145029009.3422.31.camel@spectre.intellivid.com> <10000.1145031205@sss.pgh.pa.us> <1145033149.3422.41.camel@spectre.intellivid.com> <11035.1145033929@sss.pgh.pa.us> <4444C4CF.2000106@logix-tt.com> <20060418215238.GK49405@pervasive.com> Comments: In-reply-to "Jim C. Nasby" message dated "Tue, 18 Apr 2006 16:52:38 -0500" Date: Tue, 18 Apr 2006 18:22:26 -0400 Message-ID: <19388.1145398946@sss.pgh.pa.us> From: Tom Lane X-Archive-Number: 200604/401 X-Sequence-Number: 18485 "Jim C. Nasby" writes: > Actually, if you run with stats_block_level turned on you have a > first-order approximation of what is and isn't cached. Only if those stats decayed (pretty fast) with time; which they don't. regards, tom lane