Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1ucbUS-00Emi7-Jx for pgsql-performance@arkaria.postgresql.org; Fri, 18 Jul 2025 03:10:28 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.94.2) (envelope-from ) id 1ucbUQ-0078BJ-Jz for pgsql-performance@arkaria.postgresql.org; Fri, 18 Jul 2025 03:10:27 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1ucbUQ-0078B4-9P for pgsql-performance@lists.postgresql.org; Fri, 18 Jul 2025 03:10:26 +0000 Received: from sss.pgh.pa.us ([68.162.161.243]) by magus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1ucbUO-008Mj5-1n for pgsql-performance@lists.postgresql.org; Fri, 18 Jul 2025 03:10:26 +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 56I3AL3m1774626; Thu, 17 Jul 2025 23:10:21 -0400 From: Tom Lane To: Jerry Brenner cc: pgsql-performance@lists.postgresql.org Subject: Re: Is there a way to identify a plan generated by GECO? In-reply-to: References: <1761501.1752803865@sss.pgh.pa.us> Comments: In-reply-to Jerry Brenner message dated "Thu, 17 Jul 2025 19:30:27 -0700" MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <1774624.1752808221.1@sss.pgh.pa.us> Date: Thu, 17 Jul 2025 23:10:21 -0400 Message-ID: <1774625.1752808221@sss.pgh.pa.us> List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk Jerry Brenner writes: > I don't have any background with the randomized search. Does the repeated > pattern with the same plan being executed multiple times in a time range > and then the plan changes, never to change back, match the expectation with > the randomization? [ shrug... ] Insufficient information. There could be some plan caching going on that contributes to this effect, though. regards, tom lane