Oracle数据库表被锁了，如何解锁

Posted 2022-05-24 OkidoGreen

急救SQL：查出所有被锁表的 sid 和 serial#，拼接成kill语句

select 'alter system kill session ''' || b.sid || ',' || b.serial# || '''immediate;'
from v$locked_object a,v$session b
where a.session_id = b.sid and a.SESSION_ID in
(select a.session_id
from v$locked_object f,dba_objects d
where d.object_id = f.object_id and d.OBJECT_NAME='T_CHANNEL_CONTACT') and b.username='MOBILEAPP'

alter system kill session '359,62263' immediate;

参考文章：

(765条消息) 1.oracle如何解决锁表_bunny_lhc的博客-CSDN博客_oracle 锁表https://blog.csdn.net/weixin_40068220/article/details/120643721

(765条消息) 怎么查看oracle数据库的表是否被锁 - CSDNhttps://www.csdn.net/tags/NtDaMg3sMjA4MjUtYmxvZwO0O0OO0O0O.htmlOracle查看锁表的SQL方法 - 动力节点Oracle查看锁表的SQL方法http://www.bjpowernode.com/hot/2211.html1. 首先查看数据库中哪些表被锁了，找到session ID：

使用sql：

select b.owner,b.object_name,a.session_id,a.locked_mode
from v$locked_object a,dba_objects b
where b.object_id = a.object_id;

OWNER ：数据表的所有者用户

OBJECT_NAME： 被锁住的表名

SESSION_ID： 会话ID

LOCKED_MODE： 锁级别

锁级别分为6级：

1级锁有：Select

2级锁有：Select for update,Lock For Update,Lock Row Share

3级锁有：Insert, Update, Delete, Lock Row Exclusive

4级锁有：Create Index, Lock Share

5级锁有：Lock Share Row Exclusive 

6级锁有：Alter table, Drop table, Drop Index, Truncate table, Lock Exclusive

2.再执行该语句，查看会话id

select b.username,b.sid,b.serial#,logon_time 
from v$locked_object a,v$session b
where a.session_id = b.sid order by b.logon_time;

3.杀会话

alter system kill session 'sid,serial#';

例子：

alter system kill session '20,30153'; -----这个是我刚才杀死会话前的执行语句

如果有ora-00031错误，则在后面加immediate;

alter system kill session '20,30153' immediate;

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锁表SQL

1.查看是否有锁表的sql

代码如下:

select 'blocker('||lb.sid||':'||sb.username||')-sql:'|| qb.sql_text blockers,
'waiter ('||lw.sid||':'||sw.username||')-sql:'|| qw.sql_text waiters
from v$lock lb,
v$lock lw,
v$session sb,
v$session sw,
v$sql qb,
v$sql qw
where lb.sid=sb.sid
and lw.sid=sw.sid
and sb.prev_sql_addr=qb.address
and sw.sql_address=qw.address
and lb.id1=lw.id1
and sw.lockwait is not null
and sb.lockwait is null
and lb.block=1 ;

2.查看被锁的表

代码如下:

select p.spid,a.serial#,c.object_name,b.session_id,b.oracle_username,b.os_user_name
from v$process p,v$session a, v$locked_object b,all_objects c
where p.addr=a.paddr and a.process=b.process and c.object_id=b.object_id ;

3.查看那个用户那个进程造成死锁，锁的级别

代码如下:

select b.owner,b.object_name,l.session_id,l.locked_mode fromv$locked_object l, dba_objects

4.查看连接的进程

代码如下:

SELECT sid, serial#, username, osuser FROMv$session;

5.查看是哪个session引起的

代码如下:

select b.username,b.sid,b.serial#,logon_time
from v$locked_object a,v$session b
where a.session_id = b.sid order by b.logon_time;

6.杀掉进程

代码如下:

alter system kill session 'sid,serial#';

通过上述相信大家对Oracle查看锁表的SQL方法已经有所了解，希望对大家能够有所帮助。