人大金仓处理锁

Posted 2023-03-29 刚好遇见Mysql

查找阻塞者和被阻塞

SELECT
blocking_activity.datname as "数据库",
blocking_activity.application_name as "持锁会话程序名",
blocking_activity.client_addr as "持锁会话地址",
now()-blocking_activity.query_start as "阻塞时长(s)",
blocked_locks.pid AS "被阻塞会话ID",
blocked_activity.usename AS "被阻塞用户",
blocking_locks.pid AS "持锁会话ID",
blocking_activity.usename AS "持锁用户",
blocked_activity. QUERY AS "被锁SQL",
blocking_activity. QUERY AS "持锁SQL"
FROM
sys_catalog.sys_locks blocked_locks
JOIN sys_catalog.sys_stat_activity blocked_activity ON blocked_activity.pid = blocked_locks.pid
JOIN sys_catalog.sys_locks blocking_locks ON blocking_locks.locktype = blocked_locks.locktype
AND blocking_locks. DATABASE IS NOT DISTINCT
FROM
blocked_locks. DATABASE
AND blocking_locks.relation IS NOT DISTINCT
FROM
blocked_locks.relation
AND blocking_locks.page IS NOT DISTINCT
FROM
blocked_locks.page
AND blocking_locks.tuple IS NOT DISTINCT
FROM
blocked_locks.tuple
AND blocking_locks.virtualxid IS NOT DISTINCT
FROM
blocked_locks.virtualxid
AND blocking_locks.transactionid IS NOT DISTINCT
FROM
blocked_locks.transactionid
AND blocking_locks.classid IS NOT DISTINCT
FROM
blocked_locks.classid
AND blocking_locks.objid IS NOT DISTINCT
FROM
blocked_locks.objid
AND blocking_locks.objsubid IS NOT DISTINCT
FROM
blocked_locks.objsubid
AND blocking_locks.pid != blocked_locks.pid
JOIN sys_catalog.sys_stat_activity blocking_activity ON blocking_activity.pid = blocking_locks.pid
WHERE
NOT blocked_locks.GRANTED;

　　通过pg_stat_activity视图查找阻塞和被阻塞

select pid,now()-query_start as "执行时间",wait_event_type,wait_event,query from pg_stat_activity where state<>\'idle\';

　　select * from pg_locks;

   干掉阻塞的会话

select pg_cacanl_backend(9864);
select pg_terminate_backend(9864);

　　

pg_cancel_backend() 的作用是关闭session正在执行的语句，回滚所有未提交的操作；但是不关闭整个session。
pg_terminate_backend()的作用是直接关闭整个会话，回滚所有未提交的操作。