oracle 查看死锁和解锁

1.下面的语句用来查询哪些对象被锁：

select object_name,machine,s.sid,s.serial#

from v$locked_object l,dba_objects o ,v$session s
where l.object_id　=　o.object_id and l.session_id=s.sid;

2.下面的语句用来杀死一个进程：

alter system kill session '1634,6813';