关键字
oscar lock
问题描述
oscar 数据库上锁问题如何排查
解决问题思路
准备数据
create table lock_test(name varchar(10),age varchar(10));
insert into lock_test values('ff','10');
insert into lock_test values('yy','20');
insert into lock_test values('ll','30');
session1：
begin;
update lock_test set age = 'session1' where name = 'ff';
session2：
begin;
update lock_test set age = 'session2' where name = 'ff';
session2 因为更新同一行数据肯定 pending
-- 查询阻塞PID及SQL
SELECT a.SID,a.STATUS,a.BLOCKING_SESSION,a.EVENT,a.CURRENT_SQL,a.PREV_SQL ,b.CURRENT_SQL AS BLOCK_CURRENT_SQL, b.PREV_SQL AS BLOCK_PREV_SQL
FROM V$SESSION a JOIN V$SESSION b ON a.BLOCKING_SESSION = b.sid WHERE a.BLOCKING_SESSION IS NOT NULL ;
|SID|STATUS|BLOCKING_SESSION|EVENT |CURRENT_SQL |PREV_SQL|BLOCK_CURRENT_SQL|BLOCK_PREV_SQL |
|---|------|----------------|-----------|-------------------------------------------------------|--------|-----------------|-------------------------------------------------------|
|9 |ACTIVE|10 |RowLockWait|update lock_test set age = 'session2' where name = 'ff'|begin | |update lock_test set age = 'session1' where name = 'ff'|
这里可以明显看到是 10 阻塞了 9
kill掉指定的SQL语句：
KILL SESSION 10 IMMEDIATE;
模拟二
session1：
begin;
update lock_test set age = 'session1' where name = 'ff';
session2：
alter table lock_test add column name1 varchar(100);
依然可以使用如上的方式查找及kill问题总结
oscar数据库的锁排查方法