From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
Cc: | Mariel Cherkassky <mariel(dot)cherkassky(at)gmail(dot)com>,pgsql-admin(at)lists(dot)postgresql(dot)org |
Subject: | Re: pg_authid has duplicated rows |
Date: | 2018-07-23 20:43:19 |
Message-ID: | CA916A7F-0469-45B5-9AC3-1AC0F5CCB859@anarazel.de |
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Lists: | pgsql-admin |
On July 23, 2018 1:33:11 PM PDT, Alvaro Herrera <alvherre(at)2ndquadrant(dot)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It's at least one of the potential effects of the out-of-date shared relcache bug I recently fixed (but wasn't backpatched to 9.2, as it's unsupported).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
--
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