Received: from localhost (unknown [200.46.204.183]) by developer.postgresql.org (Postfix) with ESMTP id 11CFA2E0106 for ; Fri, 6 Jun 2008 21:32:04 -0300 (ADT) Received: from developer.postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.183]) (amavisd-maia, port 10024) with ESMTP id 13590-02-6 for ; Fri, 6 Jun 2008 21:31:46 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from sss.pgh.pa.us (sss.pgh.pa.us [66.207.139.130]) by developer.postgresql.org (Postfix) with ESMTP id 12AD82E00C3 for ; Fri, 6 Jun 2008 21:19:38 -0300 (ADT) Received: from sss2.sss.pgh.pa.us (tgl@localhost [127.0.0.1]) by sss.pgh.pa.us (8.14.2/8.14.2) with ESMTP id m570JM2I008359; Fri, 6 Jun 2008 20:19:22 -0400 (EDT) To: Robert Treat cc: pgsql-hackers@postgresql.org, Peter Eisentraut , Greg Smith , Andreas Pflug , Decibel! , Josh Berkus Subject: Re: Overhauling GUCS In-reply-to: <200806061624.29105.xzilla@users.sourceforge.net> References: <48409D1E.3070208@agliodbs.com> <29525.1212613052@sss.pgh.pa.us> <200806061435.01196.peter_e@gmx.net> <200806061624.29105.xzilla@users.sourceforge.net> Comments: In-reply-to Robert Treat message dated "Fri, 06 Jun 2008 16:24:28 -0400" Date: Fri, 06 Jun 2008 20:19:22 -0400 Message-ID: <8358.1212797962@sss.pgh.pa.us> From: Tom Lane X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200806/334 X-Sequence-Number: 119447 Robert Treat writes: > There is a saying, something like "The accumulation of annecdotes is not > data". Well, we seem to have a high bar on what proof we need to actually > change a default GUC settings. default_statistics_target is a prime example, > where almost no one i know has ever recommended 10 as a default, or suggests > setting it to 10 as an way to improve performance, but the effort to get it > changed to something more reasonable has been monumental. Actually, the reason it's still 10 is that the effort expended to get it changed has been *ZERO*. I keep asking for someone to make some measurements, do some benchmarking, anything to make a plausible case for a specific higher value as being a reasonable place to set it. The silence has been deafening. regards, tom lane