SELECT
  pg_stat_activity.pid,
  COALESCE(pg_class.relname, 'null') AS relname,
  COALESCE(pg_locks.transactionid, 'null') AS transactionid,
  pg_locks.granted,
  pg_stat_activity.query,
  age(now(), pg_stat_activity.query_start)::text AS age
FROM pg_stat_activity, pg_locks LEFT OUTER JOIN pg_class ON (pg_locks.relation = pg_class.oid)
WHERE pg_stat_activity.query <> '<insufficient privilege>'
AND pg_locks.pid = pg_stat_activity.pid
AND pg_locks.mode = 'ExclusiveLock'
ORDER BY query_start