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Re: Debugging a backend stuck consuming CPU

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On 05/19/2016 06:46 AM, ktm@xxxxxxxx wrote:
Hi PostgreSQL community,

I am investigating a problem with a backend that appears to be stuck
and spinning while performing a "DISCARD ALL" command. The system is
running an older release 9.2.2. Are there any bugs that could be
causing this behavior? How can I tell what the process is actually
doing? It does not respond to either pg_cancel_backend() or to
pg_terminate_backend() so it is acting like it is not receiving the
signals. Any ideas on how to debug this would be appriciated.

What does the Postgres log show around the time of the command and/or currently?

What OS and does it's system log show anything?

Can you query pg_stat_activity?

http://www.postgresql.org/docs/9.2/static/monitoring-stats.html#PG-STAT-ACTIVITY-VIEW


Regards,
Ken




--
Adrian Klaver
adrian.klaver@xxxxxxxxxxx


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