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 1uSIzq-005yJW-R3 for pgsql-admin@arkaria.postgresql.org; Thu, 19 Jun 2025 17:24:18 +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 1uSIzm-00D6Jg-Ms for pgsql-admin@arkaria.postgresql.org; Thu, 19 Jun 2025 17:24:15 +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 1uSIzm-00D6H6-AP for pgsql-admin@lists.postgresql.org; Thu, 19 Jun 2025 17:24:14 +0000 Received: from mailout.easymail.ca ([64.68.200.34]) by magus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1uSIzk-002z12-06 for pgsql-admin@lists.postgresql.org; Thu, 19 Jun 2025 17:24:14 +0000 Received: from localhost (localhost [127.0.0.1]) by mailout.easymail.ca (Postfix) with ESMTP id 7A32EE40F6 for ; Thu, 19 Jun 2025 17:24:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=elevated-dev.com; s=easymail; t=1750353849; bh=N8qOOCeInocD1+ULceen0RRORlL3QT30iBoKTmkdAFs=; h=From:Subject:Date:To:From; b=f8rQdbpDmoZrVNKpHqz2dHv8dak2tLfGLIyiRC/0e9BvjepR3SZja+yV+okR5F8w3 tkdXlYCgLHTgobCeJkr/wi0/ceVCeutfl4Mr68Bh6+M0QoGhC5uNe5KstRdC6ZV9ed vLAXBcurf/ZcMawE9AQonr5RckgUCqawxCk+TdWm90UYOQDPRdKsG6AXyTfPt1kgKX 8j2QaFPiikT/3T8TtNWwGleD2E1A33rL+AYWsflL9zAHUbgefyHFU3Vdda/8HE9bmx CJUFrYpwjYYNCnLgLOnlTbjOcNDoNxcT29BfUaNu6rtuJ6Z8Z9YzWpV8zL4Q5V4X4a ZreIWD5sV7DTw== X-Virus-Scanned: Debian amavisd-new at emo08-pco.easydns.vpn Received: from mailout.easymail.ca ([127.0.0.1]) by localhost (emo08-pco.easydns.vpn [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 7dZJZusmfeHT for ; Thu, 19 Jun 2025 17:24:09 +0000 (UTC) Received: from smtpclient.apple (165.140.184.195.ip.vcn.com [165.140.184.195]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mailout.easymail.ca (Postfix) with ESMTPSA id 21AC4E40FC for ; Thu, 19 Jun 2025 17:24:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=elevated-dev.com; s=easymail; t=1750353849; bh=N8qOOCeInocD1+ULceen0RRORlL3QT30iBoKTmkdAFs=; h=From:Subject:Date:To:From; b=f8rQdbpDmoZrVNKpHqz2dHv8dak2tLfGLIyiRC/0e9BvjepR3SZja+yV+okR5F8w3 tkdXlYCgLHTgobCeJkr/wi0/ceVCeutfl4Mr68Bh6+M0QoGhC5uNe5KstRdC6ZV9ed vLAXBcurf/ZcMawE9AQonr5RckgUCqawxCk+TdWm90UYOQDPRdKsG6AXyTfPt1kgKX 8j2QaFPiikT/3T8TtNWwGleD2E1A33rL+AYWsflL9zAHUbgefyHFU3Vdda/8HE9bmx CJUFrYpwjYYNCnLgLOnlTbjOcNDoNxcT29BfUaNu6rtuJ6Z8Z9YzWpV8zL4Q5V4X4a ZreIWD5sV7DTw== From: Scott Ribe Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3826.600.51.1.1\)) Subject: update behavior Message-Id: <75F792AF-58DF-4559-A2E8-C89060D1E94E@elevated-dev.com> Date: Thu, 19 Jun 2025 11:23:58 -0600 To: Pgsql-admin X-Mailer: Apple Mail (2.3826.600.51.1.1) List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk I believe that if I UPDATE a row with the same values that it already = has, this still dirties pages, writes the row, generates a WAL entry. = There is no shortcut in the processing that's "hey, there's not really a = change here, we'll just leave storage alone". Is this correct? -- Scott Ribe scott_ribe@elevated-dev.com https://www.linkedin.com/in/scottribe/