1、查看表是否有锁：

select a.locktype,a.database,a.pid,a.mode,a.relation,b.relname
from pg_locks a
join pg_class b on a.relation = b.oid
where upper(b.relname) = 'TABLE_NAME';

select usename,current_query,query_start,procpid,client_addr from pg_stat_activity where procpid = 12345;

SELECT pg_cancel_backend(pid of the postgres process);