标签:postgresql -- 锁表 数据库 pid waiting other pg stm
查询是否锁表了
create view viewlocks as
SELECT
waiting.locktype AS waiting_locktype, --可锁定对象的类型:relation, extend, page, tuple,transactionid, virtualxid,object, userlock, advisory
waiting.relation::regclass AS waiting_table, --等待表
waiting_stm.query AS waiting_query, --等待查询
waiting.mode AS waiting_mode, --这个进程持有的或者是期望持有的锁模式
waiting.pid AS waiting_pid, --持有或者等待这个锁的服务器进程的进程ID ,如果锁是被一个预备事务持有的,那么为空
other.locktype AS previous_locktype, --当前锁的上层锁
other.relation::regclass AS previous_table,
other_stm.query AS previous_query,
other_stm.state AS previous_state,
other.mode AS Previous_mode,
other.pid AS previous_pid, --等待该pid完成(kill)
other.GRANTED AS previous_granted --如果持有锁,为真,如果等待锁,为假
FROM
pg_catalog.pg_locks AS waiting
JOIN
pg_catalog.pg_stat_activity AS waiting_stm
ON (
waiting_stm.pid = waiting.pid
)
JOIN
pg_catalog.pg_locks AS other
ON (
(
waiting."database" = other."database"
AND waiting.relation = other.relation
)
OR waiting.transactionid = other.transactionid
)
JOIN
pg_catalog.pg_stat_activity AS other_stm
ON (
other_stm.pid = other.pid
)
WHERE
NOT waiting.GRANTED
AND
waiting.pid <> other.pid;
select * from viewlocks;
如果查询到了结果,表示该表被锁 则需要释放锁定
select pg_cancel_backend(pid)
select pg_terminate_backend(pid)
标签:postgresql,--,锁表,数据库,pid,waiting,other,pg,stm 来源: https://blog.csdn.net/pg_hgdb/article/details/121926433
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