Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1UOO5P-0001FV-Pd for pgsql-performance@arkaria.postgresql.org; Sat, 06 Apr 2013 08:02:56 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.72) (envelope-from ) id 1UOO5P-0000Ne-43 for pgsql-performance@arkaria.postgresql.org; Sat, 06 Apr 2013 08:02:55 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1UOO5M-0000NW-WD for pgsql-performance@postgresql.org; Sat, 06 Apr 2013 08:02:53 +0000 Received: from smtp04.smtpout.orange.fr ([80.12.242.126] helo=smtp.smtpout.orange.fr) by magus.postgresql.org with esmtp (Exim 4.72) (envelope-from ) id 1UOO5F-0001ZQ-9c for pgsql-performance@postgresql.org; Sat, 06 Apr 2013 08:02:52 +0000 Received: from axege.com ([82.127.232.162]) by mwinf5d27 with ME id LY2i1l00H3WtTCJ03Y2iBn; Sat, 06 Apr 2013 10:02:43 +0200 Received: from localhost (localhost [127.0.0.1]) by axege.com (Postfix) with ESMTP id 7147143DE02 for ; Sat, 6 Apr 2013 10:02:42 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at myhostname="axege.com." Received: from axege.com ([127.0.0.1]) by localhost (axege.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id pTX6unE0SdTk for ; Sat, 6 Apr 2013 10:02:42 +0200 (CEST) Received: from [10.0.1.8] (lns-bzn-48f-81-56-219-232.adsl.proxad.net [81.56.219.232]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by axege.com (Postfix) with ESMTPSA id 3797943DE01 for ; Sat, 6 Apr 2013 10:02:41 +0200 (CEST) Message-ID: <515FD69F.8080805@axege.com> Date: Sat, 06 Apr 2013 10:02:39 +0200 From: Franck Routier User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130404 Thunderbird/17.0.5 MIME-Version: 1.0 To: pgsql-performance@postgresql.org Subject: Re: What happens between end of explain analyze and end of query execution ? References: <515D92BF.5000309@axege.com> <515D9FC5.7030105@axege.com> <18910.1365092713@sss.pgh.pa.us> <515DCB34.6040801@axege.com> <6354.1365102532@sss.pgh.pa.us> <515ED7BC.40907@axege.com> <4113.1365171448@sss.pgh.pa.us> In-Reply-To: <4113.1365171448@sss.pgh.pa.us> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha1; boundary="------------ms010609040308090803070205" X-Pg-Spam-Score: -1.1 (-) List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-performance Precedence: bulk Sender: pgsql-performance-owner@postgresql.org Ceci est un message signé cryptographiquement au format MIME. --------------ms010609040308090803070205 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Le 05/04/2013 16:17, Tom Lane a =E9crit : > Franck Routier writes: >> Le 04/04/2013 21:08, Tom Lane a =E9crit : >>> Hmph. Can't see any reason for that to take a remarkably long time t= o >>> plan. Can you put together a self-contained test case demonstrating >>> excessive planning time? What PG version is this, anyway? >> What I notice is that removing joins has a huge impact on the time >> explain takes to return: > Hm, kind of looks like it's just taking an unreasonable amount of time > to process each join clause. What have you got the statistics targets > set to in this database? What are the datatypes of the join columns? > And (again) what PG version is this exactly? > > regards, tom lane > > Postgresql version is 8.4.8. Value for default_statistics_target is 5000 (maybe this is the problem ?)= Join columns datatypes are all varchar(32). Also notice that not all joins have equals imppact on the time taken:=20 removing join on some tables has no impact (sanact, rsaidp), while=20 removing joins on others (saneds, sandia) has an important effect... 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