Another useful tool for monitoring database activity is the
pg_locks system table. It allows the
database administrator to view information about the outstanding
locks in the lock manager. For example, this capability can be used
to:
View all the locks currently outstanding, all the locks on
relations in a particular database, all the locks on a
particular relation, or all the locks held by a particular
EnterpriseDB session.
Determine the relation in the current database with the most
ungranted locks (which might be a source of contention among
database clients).
Determine the effect of lock contention on overall database
performance, as well as the extent to which contention varies
with overall database traffic.
