Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e71vb-0000M0-0H for pgsql-performance@arkaria.postgresql.org; Tue, 24 Oct 2017 16:19:43 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.84_2) (envelope-from ) id 1e71vZ-00012S-TE for pgsql-performance@arkaria.postgresql.org; Tue, 24 Oct 2017 16:19:41 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1e71tn-0006Ng-Jv for pgsql-performance@postgresql.org; Tue, 24 Oct 2017 16:17:51 +0000 Received: from smtprelay0026.b.hostedemail.com ([64.98.42.26] helo=smtprelay.b.hostedemail.com) by magus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1e71ti-000660-M7 for pgsql-performance@postgresql.org; Tue, 24 Oct 2017 16:17:50 +0000 Received: from filter.hostedemail.com (10.5.19.248.rfc1918.com [10.5.19.248]) by smtprelay01.b.hostedemail.com (Postfix) with ESMTP id B033A2D2C86; Tue, 24 Oct 2017 16:17:18 +0000 (UTC) X-Session-Marker: 616C76686572726540616C76682E6E6F2D69702E6F7267 X-Spam-Summary: 50,0,0,,d41d8cd98f00b204,alvherre@alvh.no-ip.org,:::::,RULES_HIT:41:355:379:599:967:973:988:989:1260:1277:1311:1312:1313:1314:1345:1359:1437:1515:1516:1518:1519:1534:1538:1593:1594:1595:1596:1711:1714:1730:1747:1777:1792:2393:2525:2561:2564:2682:2685:2828:2859:2933:2937:2939:2942:2945:2947:2951:2954:3022:3138:3139:3140:3141:3142:3350:3865:3867:3868:3873:3934:3936:3938:3941:3944:3947:3950:3953:3956:3959:4250:4605:5007:6261:8985:9025:9121:10004:10400:10848:11026:11232:11658:11914:12043:12438:12660:13069:13311:13357:13439:13894:13895:14180:14181:14721:14764:21060:21080:21627:30054,0,RBL:none,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:,MSBL:0,DNSBL:none,Custom_rules:0:0:0,LFtime:5,LUA_SUMMARY:none X-HE-Tag: glue31_79c448725a15b X-Filterd-Recvd-Size: 1579 Received: from alvin.alvh.no-ip.org (net-37-182-231-222.cust.vodafonedsl.it [37.182.231.222]) (Authenticated sender: alvherre@alvh.no-ip.org) by omf07.b.hostedemail.com (Postfix) with ESMTPA; Tue, 24 Oct 2017 16:17:16 +0000 (UTC) Received: by alvin.alvh.no-ip.org (Postfix, from userid 1000) id 2EDD31033; Tue, 24 Oct 2017 18:17:15 +0200 (CEST) Date: Tue, 24 Oct 2017 18:17:15 +0200 From: Alvaro Herrera To: johannes =?iso-8859-1?Q?gra=EBn?= Cc: Pavel Stehule , "pgsql-performance@postgresql.org" Subject: Re: performance drop after upgrade (9.6 > 10) Message-ID: <20171024161715.admzmcnbpagm6yvf@alvherre.pgsql> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: NeoMutt/20170306-137-4415bd-dirty (1.8.0) 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 johannes graėn wrote: > Hi Pavel, *, > > you were right with ANALYZing the DB first. However, even after doing > so, I frequently see Seq Scans where an index was used before. This > usually cooccurs with parallelization and looked different before > upgrading to 10. I can provide an example for 10 [1], but I cannot > generate a query plan for 9.6 anymore. https://wiki.postgresql.org/wiki/Slow_Query_Questions -- Įlvaro Herrera https://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services -- Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance