Hi Tom, thank you for your input. The DB was stuck again, I attach all logs and stack traces.
A stack trace from a COMMIT, an INSERT, an UPDATE, the wal writer, the
writer, and a sequence.
Stracing the commit was stuck at: semop(3145761, {{12, -1, 0}}, 1
Please tell me what else could I do to help debugging.
Is there a way to downgrade postgresql ?
*Spiros Ioannou IT Manager, inAccesswww.inaccess.com
<http://www.inaccess.com>M: +30 6973-903808T: +30 210-6802-358*
On 20 July 2015 at 01:01, Tom Lane <t...@sss.pgh.pa.us> wrote:
> Spiros Ioannou <siv...@inaccess.com> writes:
> > We upgraded to 9.4.4 from 8.4 We have tried 9.3.x in the past with
> success.
> > Unfortunately in 9.4 gets stuck 2-3 times a week.
>
> > Lots of queries seem stuck, that is they have waiting:false. Queries can
> be
> > COMMIT or INSERT.
> > No blocking locks seem to exist.
> > strace reveals that all stuck processes they are in semop
> > semop(2064417, {{0, -1, 0}}, 1^C <unfinished ...>
>
> Stack traces of the stuck processes might help determine what's going on.
>
>
> https://wiki.postgresql.org/wiki/Generating_a_stack_trace_of_a_PostgreSQL_backend
>
> Please try to capture traces for both the COMMIT and INSERT cases,
> as they're almost certainly different.
>
> regards, tom lane
>
db9lock.tar.gz
Description: GNU Zip compressed data
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