Received: from localhost (maia-1.hub.org [200.46.204.191]) by postgresql.org (Postfix) with ESMTP id A31A89FB5C7 for ; Tue, 17 Apr 2007 01:44:39 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.191]) (amavisd-maia, port 10024) with ESMTP id 88750-09-2 for ; Tue, 17 Apr 2007 01:44:35 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.4 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by postgresql.org (Postfix) with ESMTP id A620D9FB67E for ; Tue, 17 Apr 2007 01:44:35 -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 l3H4iXmM014930; Tue, 17 Apr 2007 00:44:33 -0400 (EDT) To: robins@pobox.com cc: pgsql-performance@postgresql.org Subject: Re: Fwd: Strangely Variable Query Performance In-reply-to: <36af4bed0704162043k23e6bde4hf3d9840dc359f010@mail.gmail.com> References: <57271CC2-BCB1-4ACA-A177-4FF64F1BC33F@brandeis.edu> <10355.1176422445@sss.pgh.pa.us> <10503.1176423606@sss.pgh.pa.us> <12360.1176436194@sss.pgh.pa.us> <12736.1176439091@sss.pgh.pa.us> <36af4bed0704162024t23f7d6bbnf4b8042b82b16935@mail.gmail.com> <36af4bed0704162043k23e6bde4hf3d9840dc359f010@mail.gmail.com> Comments: In-reply-to Robins message dated "Tue, 17 Apr 2007 09:13:30 +0530" Date: Tue, 17 Apr 2007 00:44:33 -0400 Message-ID: <14929.1176785073@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200704/324 X-Sequence-Number: 24201 Robins writes: > If and when you do come up with a solution, please do post some details > about them here... (i say that coz it seems that for obvious reasons, things > must have gone off air after tom's last email, and one can understand that). > But an analysis, or atleast a pointer may be of help to someone (like me) > reading this list. Oh, sorry, the subsequent discussion moved over to pgsql-hackers: http://archives.postgresql.org/pgsql-hackers/2007-04/msg00621.php and -patches: http://archives.postgresql.org/pgsql-patches/2007-04/msg00374.php Those are good places to look if a discussion on -bugs or other lists seems to tail off... regards, tom lane PS: the reason I couldn't reproduce the behavior was just that the dummy data I was using didn't have the right statistics.