提交事务的时候提示（数据库被一个用户锁住的解决方法）

select object_id,session_id,locked_mode from v$locked_object;

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;

alter system kill session 'sid,serial#';

alter system kill session '7,10839'