Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nfApA-0005VP-Km for pgsql-hackers@arkaria.postgresql.org; Fri, 15 Apr 2022 01:32:36 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1nfAp9-0004Xi-GP for pgsql-hackers@arkaria.postgresql.org; Fri, 15 Apr 2022 01:32:35 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nfAp9-0004XY-71 for pgsql-hackers@lists.postgresql.org; Fri, 15 Apr 2022 01:32:35 +0000 Received: from sss.pgh.pa.us ([66.207.139.130]) by magus.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1nfAp6-0001LH-Q9 for pgsql-hackers@lists.postgresql.org; Fri, 15 Apr 2022 01:32:34 +0000 Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1]) by sss.pgh.pa.us (8.15.2/8.15.2) with ESMTP id 23F1WRSf1570895; Thu, 14 Apr 2022 21:32:27 -0400 From: Tom Lane To: Peter Geoghegan cc: Andres Freund , Noah Misch , David Rowley , PostgreSQL Hackers Subject: Re: Intermittent buildfarm failures on wrasse In-reply-to: References: <1364997.1649893086@sss.pgh.pa.us> <1365924.1649893883@sss.pgh.pa.us> <1374062.1649896550@sss.pgh.pa.us> <20220414010505.s7z24jxrfsjbzz7l@alap3.anarazel.de> <1401379.1649899392@sss.pgh.pa.us> <20220414015112.yhruzx3dbjnz4pji@alap3.anarazel.de> <20220414025122.GA808845@rfd.leadboat.com> <1486022.1649952083@sss.pgh.pa.us> <20220414161850.ibqkevxcv6a7vdxg@alap3.anarazel.de> <1521388.1649953580@sss.pgh.pa.us> <1547912.1649971995@sss.pgh.pa.us> <1553951.1649975018@sss.pgh.pa.us> Comments: In-reply-to Peter Geoghegan message dated "Thu, 14 Apr 2022 18:18:40 -0700" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <1570893.1649986347.1@sss.pgh.pa.us> Date: Thu, 14 Apr 2022 21:32:27 -0400 Message-ID: <1570894.1649986347@sss.pgh.pa.us> List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk Peter Geoghegan writes: > Are you aware of Andres' commit 02fea8fd? That work prevented exactly > the same set of symptoms (the same index-only scan create_index > regressions), Hm. I'm starting to get the feeling that the real problem here is we've "optimized" the system to the point where repeatable results from VACUUM are impossible :-( regards, tom lane