数据库死锁查询

SELECT
    blocked_locks.pid         AS blocked_pid,
    blocked_activity.usename  AS blocked_user,
    blocking_locks.pid        AS blocking_pid,
    blocking_activity.usename AS blocking_user,
    blocked_activity.query    AS blocked_statement,
    blocking_activity.query   AS current_statement_in_blocking_process
FROM
    pg_catalog.pg_locks blocked_locks
JOIN
    pg_catalog.pg_stat_activity blocked_activity
ON
    blocked_activity.pid = blocked_locks.pid
JOIN
    pg_catalog.pg_locks blocking_locks
ON
    blocking_locks.locktype = blocked_locks.locktype
AND blocking_locks.DATABASE IS NOT DISTINCT
FROM
    blocked_locks.DATABASE
AND blocking_locks.relation IS NOT DISTINCT
FROM
    blocked_locks.relation
AND blocking_locks.page IS NOT DISTINCT
FROM
    blocked_locks.page
AND blocking_locks.tuple IS NOT DISTINCT
FROM
    blocked_locks.tuple
AND blocking_locks.virtualxid IS NOT DISTINCT
FROM
    blocked_locks.virtualxid
AND blocking_locks.transactionid IS NOT DISTINCT
FROM
    blocked_locks.transactionid
AND blocking_locks.classid IS NOT DISTINCT
FROM
    blocked_locks.classid
AND blocking_locks.objid IS NOT DISTINCT
FROM
    blocked_locks.objid
AND blocking_locks.objsubid IS NOT DISTINCT
FROM
    blocked_locks.objsubid
AND blocking_locks.pid != blocked_locks.pid
JOIN
    pg_catalog.pg_stat_activity blocking_activity
ON
    blocking_activity.pid = blocking_locks.pid
WHERE
    NOT blocked_locks.GRANTED;