Oracle解除锁，查看锁的方法

select b.owner,b.object_name,a.session_id,a.locked_mode,c.serial#,c.sid||','||c.serial#
from v$locked_object a,dba_objects b ,v$session c
where b.object_id = a.object_id 
And a.session_id = c.sid 

alter system kill session '617,19249' immediate;