查看postgre都有哪些语句执行时间长

select 
procpid, 
start, 
now() - start as lap, 
current_query 
from 
(select 
backendid, 
pg_stat_get_backend_pid(s.backendid) as procpid, 
pg_stat_get_backend_activity_start(s.backendid) as start, 
pg_stat_get_backend_activity(s.backendid) as current_query 
from 
(select pg_stat_get_backend_idset() as backendid) as s 
) as s 
where 
current_query <> ‘<IDLE>‘ --and procpid = 17637
order by 
lap desc;