1.查哪些对象被锁，可以看下是否有自己不能插入语句的表：

select a.*,b.* from v$locked_object a,dba_objects b where b.object_id = a.object_id;

2.查出锁住对象的session ID 和serial#，获取这两个字段值：

select t2.username,t2.sid,t2.serial#,t2.logon_time
from v$locked_object t1,v$session t2
where t1.session_id=t2.sid order by t2.logon_time;

3.从2中获取的两个值，杀死session： alter system kill session 'ID,Serial#';