| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| 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 20:33:11 |
| Message-ID: | 20180723203311.7isul7yxziiw7wbx@alvherre.pgsql |
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| Lists: | pgsql-admin |
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
select xmin, xmax, ctid, oid, rolname from pg_authid
And the output of pg_controldata.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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