Check Locking Query in PostgreSQL

 

 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;