Wednesday, January 19, 2011

Postgres deadlock debugging

Update:  There is a better way to view Postgres locks and blocking chains.

Found a nice SQL query for debugging deadlocks hidden deep in the postgres docs:

select
pg_stat_activity.datname,
pg_class.relname,
pg_locks.transactionid,
pg_locks.mode,
pg_locks.granted,
pg_stat_activity.usename,
substr(pg_stat_activity.current_query,1,40) as current_query,
pg_stat_activity.query_start,
age(now(),pg_stat_activity.query_start) as "age",
pg_stat_activity.procpid
from pg_stat_activity,pg_locks
left outer join pg_class on (pg_locks.relation = pg_class.oid)
where pg_locks.pid=pg_stat_activity.procpid order by query_start;

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