From: Andres Freund <andres@anarazel.de>
To: Alvaro Herrera <alvherre@2ndquadrant.com>
Cc: Mariel Cherkassky <mariel.cherkassky@gmail.com>
Cc: pgsql-admin@lists.postgresql.org
Subject: Re: pg_authid has duplicated rows
Date: Mon, 23 Jul 2018 13:43:19 -0700
Message-ID: <CA916A7F-0469-45B5-9AC3-1AC0F5CCB859@anarazel.de> (raw)
In-Reply-To: <20180723203311.7isul7yxziiw7wbx@alvherre.pgsql>
References: <20180723203311.7isul7yxziiw7wbx@alvherre.pgsql>
On July 23, 2018 1:33:11 PM PDT, Alvaro Herrera <alvherre@2ndquadrant.com> wrote:
>On 2018-Jul-23, Andres Freund wrote:
>
>> Hi,
>>
>> On 2018-07-23 21:03:32 +0300, Mariel Cherkassky wrote:
>> > Today I faced a situation where I saw a postgresql 9.2 database
>that had
>> > duplicated rows in pg_autid. I saw 6 roles while 3 of them were
>duplicated
>> > (3 uniques rolenames in total). I checked and the oid of the
>duplicates
>> > were the same oid as the originals. The solution was running vacuum
>on the
>> > table but I wanted to understand how this situation was created ?
>Why even
>> > with unique index on the rolname I saw duplicated values for
>rolname ?
>>
>> That suggests some form of corruption. Which version of 9.2 did this
>> occur on? Did you have any OS level crashes? Ran with fsync=off?
>
>I have vague memories of seeing this recently. Can you please show
It's at least one of the potential effects of the out-of-date shared relcache bug I recently fixed (but wasn't backpatched to 9.2, as it's unsupported).
Andres
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-admin@postgresql.org
Cc: andres@anarazel.de, alvherre@2ndquadrant.com, mariel.cherkassky@gmail.com, pgsql-admin@lists.postgresql.org
Subject: Re: pg_authid has duplicated rows
In-Reply-To: <CA916A7F-0469-45B5-9AC3-1AC0F5CCB859@anarazel.de>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox