On 15 September 2010 15:39, Tom Lane <tgl@xxxxxxxxxxxxx> wrote: > An exclusive lock will block selects too. Have you looked into pg_locks > for ungranted lock requests? Well - I thought so, we have a logging script that logs the content of the pg_locks table, it didn't log anything interesting but it may be a problem with the script itself. It does an inner join on pg_locks.relation = pg_class.oid but when I check now this join seems to remove most of the rows in the pg_locks table. Does it make sense at all to join pg_class with pg_locks? I will ask the sysadm to change to an outer join as for now. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance