/* Queries holding locks other queries are waiting to be released. */

SELECT bl.pid AS blocked_pid,
  ka.query AS blocking_statement,
  now() - ka.query_start AS blocking_duration,
  kl.pid AS blocking_pid,
  a.query AS blocked_statement,
  now() - a.query_start AS blocked_duration,
  a.application_name AS blocked_sql_app,
  ka.application_name AS blocking_sql_app
FROM pg_catalog.pg_locks bl
JOIN pg_catalog.pg_stat_activity a
  ON bl.pid = a.pid
JOIN pg_catalog.pg_locks kl
  JOIN pg_catalog.pg_stat_activity ka
    ON kl.pid = ka.pid
ON bl.transactionid = kl.transactionid AND bl.pid != kl.pid
WHERE NOT bl.granted
ORDER BY blocked_duration DESC
LIMIT %{limit};
