[PostgreSQL] - Monitorando Locks no Banco de dados

Bom pessoal, segue abaixo consulta para monitorar os locks(Bloqueios de Tabelas e Registros) existentes no seu Banco de Dados PostgreSQL:

  SELECT bl.pid                 AS blocked_pid,
         a.usename              AS blocked_user,
         ka.current_query       AS blocking_statement,
         now() - ka.query_start AS blocking_duration,
         kl.pid                 AS blocking_pid,
         ka.usename             AS blocking_user,
         a.current_query        AS blocked_statement,
         now() - a.query_start  AS blocked_duration
  FROM  pg_catalog.pg_locks         bl
   JOIN pg_catalog.pg_stat_activity a  ON a.procpid = bl.pid
   JOIN pg_catalog.pg_locks         kl ON kl.transactionid = bl.transactionid AND kl.pid != bl.pid
   JOIN pg_catalog.pg_stat_activity ka ON ka.procpid = kl.pid
  WHERE NOT bl.granted;

For PostgreSQL >= 9.2:

  SELECT bl.pid                 AS blocked_pid,
         a.usename              AS blocked_user,
         ka.query               AS blocking_statement,
         now() - ka.query_start AS blocking_duration,
         kl.pid                 AS blocking_pid,
         ka.usename             AS blocking_user,
         a.query                AS blocked_statement,
         now() - a.query_start  AS blocked_duration
  FROM  pg_catalog.pg_locks         bl
   JOIN pg_catalog.pg_stat_activity a  ON a.pid = bl.pid
   JOIN pg_catalog.pg_locks         kl ON kl.transactionid = bl.transactionid AND kl.pid != bl.pid
   JOIN pg_catalog.pg_stat_activity ka ON ka.pid = kl.pid
  WHERE NOT bl.granted;