/* 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
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;