On Wed, Jan 5, 2011 at 2:09 AM, kakarukeys <kakarukeys@xxxxxxxxx> wrote: > As requested, here are some output of the investigative queries, run > when the problem occurred. I could see some locks there, but I don't > know why the alter table add constraint takes so long of time. It's pretty clear from the output you posted that it's waiting for a lock, but you didn't include the full contents of pg_stat_activity and pg_locks, so we can't see who has the lock it's waiting for. Tom's guess upthread is a good bet, though. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
