; See all running postgres queries
SELECT usename, pid, client_addr, waiting,state, query_start, state_change, query
FROM pg_stat_activity;

; See all queries that are currently blocked by another
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

; Terminate a postgres process
SELECT pg_terminate_backend(pid);

; Get the size of a postgres database
SELECT pg_size_pretty(pg_database_size('database_name'));