Received: from malur.postgresql.org ([2a02:16a8:dc51::56]) by arkaria.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1fQdSC-0007Hh-T7 for pgsql-admin@arkaria.postgresql.org; Wed, 06 Jun 2018 18:46:41 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.89) (envelope-from ) id 1fQdSB-00089K-QA for pgsql-admin@arkaria.postgresql.org; Wed, 06 Jun 2018 18:46:39 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1fQdSB-00088w-FN for pgsql-admin@lists.postgresql.org; Wed, 06 Jun 2018 18:46:39 +0000 Received: from mailout.easymail.ca ([64.68.200.34]) by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1fQdS8-0003VU-Li for pgsql-admin@postgresql.org; Wed, 06 Jun 2018 18:46:38 +0000 Received: from localhost (localhost [127.0.0.1]) by mailout.easymail.ca (Postfix) with ESMTP id 579CC40D83; Wed, 6 Jun 2018 18:46:35 +0000 (UTC) Received: from mailout.easymail.ca ([127.0.0.1]) by localhost (emo03-pco.easydns.vpn [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OOPXUztBgICa; Wed, 6 Jun 2018 18:46:35 +0000 (UTC) Received: from [10.190.11.133] (global67-50.pix.hs.uab.edu [164.111.67.50]) (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 380A540D82; Wed, 6 Jun 2018 18:46:31 +0000 (UTC) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 11.3 \(3445.6.18\)) Subject: Re: [pgsql-admin] "Soft-hitting" the 1600 column limit From: Scott Ribe In-Reply-To: Date: Wed, 6 Jun 2018 12:46:30 -0600 Cc: nunks , pgsql-admin Content-Transfer-Encoding: quoted-printable Message-Id: <61E35AE9-8569-40C4-8D30-7999E006C0FA@elevated-dev.com> References: <3C61E858-5CA7-405D-B32A-B4C89D1AC62E@elevated-dev.com> To: Wells Oliver X-Mailer: Apple Mail (2.3445.6.18) List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk References to them persist in system catalogs. Otherwise, dropping a = column would require rewriting every row in the table. -- Scott Ribe scott_ribe@elevated-dev.com https://www.linkedin.com/in/scottribe/ > On Jun 6, 2018, at 12:43 PM, Wells Oliver = wrote: >=20 > Just curious then, in what meaningful way do dropped columns persist, = what are the reasons? >=20