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how to get the deadlock graph in postgres

Posted on 2011-03-14
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Last Modified: 2012-08-14
HI
I would like to know how to get the deadlock graph in postgres when a deadlock occurs.

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Question by:elimesika
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by:earth man2
ID: 35152818
select * from pg_locks;
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by:elimesika
elimesika earned 0 total points
ID: 35181437
Thanks :earthman2

That is obvious, but what am I looking for is :
1) The list of nodes involved in the  deadlock.
2) The SQL statement each node was trying to process when the deadlock occurred.
3) The process that was chosen by the DB as a victim.

How can I get that information ?

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elimesika earned 0 total points
ID: 35187958
Well ,just to share the solution:

Postgres 8.4 added deadlock graph info to the server log
see
"When reporting a deadlock, report the text of all queries involved in the deadlock to the server log (Itagaki Takahiro) "
in
http://www.postgresql.org/docs/8.4/static/release-8-4.html#RELEASE-8-4-PG-HBA-CONF
The reason that I didn'r got that in my log was that I was using an EXCEPTION block on OTHERS.
That includes of course the DEADLOCK_DETECTED SQLSTATE value and masked the default behaviour.
so, to get the info, let postgres trap the deadlock and handle it.

such simple ....


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by:elimesika
ID: 35225135
I have found the solution by myself.
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