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 1m6zab-0006Us-DR for pgsql-admin@arkaria.postgresql.org; Fri, 23 Jul 2021 18:08:01 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.92) (envelope-from ) id 1m6zaa-0001YZ-DJ for pgsql-admin@arkaria.postgresql.org; Fri, 23 Jul 2021 18:08:00 +0000 Received: from makus.postgresql.org ([2001:4800:3e1:1::229]) by malur.postgresql.org with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1m6zaa-0001V8-4D for pgsql-admin@lists.postgresql.org; Fri, 23 Jul 2021 18:08:00 +0000 Received: from mailout.easymail.ca ([64.68.200.34]) by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1m6zaV-0004LD-8x for pgsql-admin@lists.postgresql.org; Fri, 23 Jul 2021 18:07:59 +0000 Received: from localhost (localhost [127.0.0.1]) by mailout.easymail.ca (Postfix) with ESMTP id 8236BA314F; Fri, 23 Jul 2021 18:07:52 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at emo05-pco.easydns.vpn Received: from mailout.easymail.ca ([127.0.0.1]) by localhost (emo05-pco.easydns.vpn [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Fw_miYzWC3gM; Fri, 23 Jul 2021 18:07:52 +0000 (UTC) Received: from smtpclient.apple (unknown [4.28.96.150]) (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 E5731A30E9; Fri, 23 Jul 2021 18:07:48 +0000 (UTC) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.100.0.2.22\)) Subject: Re: What's the dfifference between pg_start_backup+copy+pg_stop_backup+WAL vs. pg_start_backup+pg_stop_backup+copy+WAL? From: Scott Ribe In-Reply-To: <562203777.20210723194435@am-soft.de> Date: Fri, 23 Jul 2021 12:07:47 -0600 Cc: pgsql-admin@lists.postgresql.org Content-Transfer-Encoding: quoted-printable Message-Id: <6780C96C-3016-47C8-AD06-BF860283266C@elevated-dev.com> References: <1208702063.20210723115638@am-soft.de> <399c734c5b9ffe10f68bcb79a69bea000d8d0c21.camel@cybertec.at> <1751752722.20210723161202@am-soft.de> <20210723152418.GK20766@tamriel.snowman.net> <562203777.20210723194435@am-soft.de> To: =?utf-8?Q?Thorsten_Sch=C3=B6ning?= X-Mailer: Apple Mail (2.3654.100.0.2.22) List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk > On Jul 23, 2021, at 11:44 AM, Thorsten Sch=C3=B6ning = wrote: >=20 > So why is that row used at all instead of simply ignored? Because it is in the file. WAL can re-do changes, it cannot undo them.