1. 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;