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 <pgsql-admin-owner+archive@lists.postgresql.org>)
	id 1fhxon-0002TL-Bx
	for pgsql-admin@arkaria.postgresql.org; Tue, 24 Jul 2018 13:57:37 +0000
Received: from localhost ([127.0.0.1] helo=malur.postgresql.org)
	by malur.postgresql.org with esmtp (Exim 4.89)
	(envelope-from <pgsql-admin-owner+archive@lists.postgresql.org>)
	id 1fhxol-0001bB-Ns
	for pgsql-admin@arkaria.postgresql.org; Tue, 24 Jul 2018 13:57:35 +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 <tgl@sss.pgh.pa.us>)
	id 1fhxol-0001b3-Ch
	for pgsql-admin@lists.postgresql.org; Tue, 24 Jul 2018 13:57:35 +0000
Received: from sss.pgh.pa.us ([66.207.139.130])
	by makus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256)
	(Exim 4.89)
	(envelope-from <tgl@sss.pgh.pa.us>)
	id 1fhxoi-0004eP-Ty
	for pgsql-admin@lists.postgresql.org; Tue, 24 Jul 2018 13:57:34 +0000
Received: from sss1.sss.pgh.pa.us (localhost [127.0.0.1])
	by sss.pgh.pa.us (8.14.4/8.14.4) with ESMTP id w6ODvS6Z001603;
	Tue, 24 Jul 2018 09:57:28 -0400
From: Tom Lane <tgl@sss.pgh.pa.us>
To: Mariel Cherkassky <mariel.cherkassky@gmail.com>
cc: Andres Freund <andres@anarazel.de>,
        Alvaro Herrera <alvherre@2ndquadrant.com>,
        pgsql-admin@lists.postgresql.org
Subject: Re: pg_authid has duplicated rows
In-reply-to: 
 <CA+t6e1=BngUk6xPzZX2-LcYRiFSGKYUfqkgX8PPdxtZNNJX7fg@mail.gmail.com>
References: <20180723203311.7isul7yxziiw7wbx@alvherre.pgsql>
 <CA916A7F-0469-45B5-9AC3-1AC0F5CCB859@anarazel.de>
 <CA+t6e1=BngUk6xPzZX2-LcYRiFSGKYUfqkgX8PPdxtZNNJX7fg@mail.gmail.com>
Comments: In-reply-to Mariel Cherkassky <mariel.cherkassky@gmail.com>
	message dated "Tue, 24 Jul 2018 12:26:34 +0300"
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-ID: <1601.1532440648.1@sss.pgh.pa.us>
Date: Tue, 24 Jul 2018 09:57:28 -0400
Message-ID: <1602.1532440648@sss.pgh.pa.us>
List-Id: <pgsql-admin.lists.postgresql.org>
List-Help: <https://lists.postgresql.org/manage/>
List-Subscribe: <https://lists.postgresql.org/manage/>
List-Post: <mailto:pgsql-admin@lists.postgresql.org>
List-Owner: <mailto:pgsql-admin-owner@lists.postgresql.org>
List-Archive: <https://www.postgresql.org/list/pgsql-admin>
Precedence: bulk

Mariel Cherkassky <mariel.cherkassky@gmail.com> writes:
> I checked it also in version 9.6, and in this version I can edit the
> pg_authid table. I'm suppose to get an error that the table is a system
> catalog or am I wrong ?

No, the "system catalog modification" restriction only applies to DDL
on the system catalogs --- for instance, adding/removing a column, which
our C code couldn't cope with.  You're free to change their contents by
hand if you're a superuser.  (And if you break something that way, you
get to keep both pieces.  But sometimes it's necessary.)

			regards, tom lane