Re: Query running for 12 hours

On 05/30/2018 07:41 AM, Yavuz Selim Sertoğlu wrote:
> Major upgrade would be very painful because there are many application
> running on different servers but same database server.

FYI, 9.5.3 --> 9.5.13 is considered a minor upgrade.

> Their tests would take too much time.
> So I will try to go with minor upgrade.
>
> Thanks for your help, have a good day.
>
>
>
>
> Remaining suggestions/questions:
>
> 1) If it still exists look in Postgres log around  2018-05-30
> 02:00:00, the time the problematic queries started, to see if there
> are any entries of note.
>
> 2) You are on Postgres 9.5.3 and the most recent release 9.5.13.
> There have been a lot of bug fixes in the interim and it would be a
> good idea to upgrade. It is minor release upgrade but I would go
> through the release notes first:
>
> https://www.postgresql.org/docs/9.5/static/release.html
> <https://www.postgresql.org/docs/9.5/static/release.html>
>
> as there some thing that might require your action.
>
> 3) I suggest 2) because a quick scan of the release notes found this:
>
> https://www.postgresql.org/docs/9.5/static/release-9-5-11.html
> <https://www.postgresql.org/docs/9.5/static/release-9-5-11.html>
>
> "
>
> Cope with failure to start a parallel worker process (Amit Kapila,
> Robert Haas)
>
> Parallel query previously tended to hang indefinitely if a worker
> could not be started, as the result of fork() failure or other
> low-probability problems.
> "
>
> Is it possible that parallel query:
>
> https://www.postgresql.org/docs/10/static/when-can-parallel-query-be-used.html
> <https://www.postgresql.org/docs/10/static/when-can-parallel-query-be-used.html>
>
> is in use?
>
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>     --     Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com <mailto:adrian(dot)klaver(at)aklaver(dot)com>
> <mailto:adrian(dot)klaver(at)aklaver(dot)com
> <mailto:adrian(dot)klaver(at)aklaver(dot)com>>
>
>
>
>
>
> --
> Adrian Klaver
> adrian(dot)klaver(at)aklaver(dot)com <mailto:adrian(dot)klaver(at)aklaver(dot)com>
>
>
>
>

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com