如何解决PostgreSQL执行语句长时间卡着不动不报错也不执行的问题

truncate table simple;

select pg_blocking_pids(pid),pid,now()-xact_start,wait_event,wait_event_type,substr(query,1,100) from pg_stat_activity where state <> ‘idle' order by 3 desc;

test=# select pg_blocking_pids(pid),pid,now()-xact_start,wait_event,wait_event_type,substr(query,1,100) from pg_stat_activity where state <> 'idle' order by 3 desc;
 pg_blocking_pids | pid |    ?column?     | wait_event | wait_event_type |                                                substr

------------------+-----+-----------------+------------+-----------------+----------------------------------------------------------------------------------------------
--------
 {}               | 592 | 00:53:35.188996 | ClientRead | Client          | lock table simple in access  exclusive mode;
 {592}            | 641 | 00:17:37.498617 | relation   | Lock            | truncate table simple;
 {}               | 750 | 00:00:00        |            |                 | select pg_blocking_pids(pid),pid,now()-xact_start,wait_event,wait_event_type,substr(query,1,1
00) fro
(3 rows)

test=# select pg_terminate_backend(592);
 pg_terminate_backend
----------------------
 t
(1 row)

                  View "pg_catalog.pg_stat_activity"