postgres查看是否锁表
select oid from pg_database where datname = ‘库名’

select oid from pg_class where relname=‘表名’　　　　#注意pg_class不是全局，需要切换到相应的库里去查询

记住2个oid的值

select pid from pg_locks where relation = oid的值

select datname,query,pid from pg_stat_activity where pid in (pid的值)　　　　查看锁的类型

select pg_terminate_backend(pid) 　　　　释放锁

select pid, state, usename, query, query_start 
from pg_stat_activity 
where pid in (
  select pid from pg_locks l 
  join pg_class t on l.relation = t.oid 
  and t.relkind = 'r' 
);