select   sn.username, m.sid,sn.serial#, m.type,
         decode (m.lmode,
                 0, 'none',
                 1, 'null',
                 2, 'row share',
                 3, 'row excl.',
                 4, 'share',
                 5, 's/row excl.',
                 6, 'exclusive',
                 lmode, ltrim (to_char (lmode, '990'))
                ) lmode,
         decode (m.request,
                 0, 'none',
                 1, 'null',
                 2, 'row share',
                 3, 'row excl.',
                 4, 'share',
                 5, 's/row excl.',
                 6, 'exclusive',
                 request, ltrim (to_char (m.request, '990'))
                ) request,
         m.id1, m.id2
    from v$session sn, v$lock m
   where (sn.sid = m.sid and m.request != 0)         --存在锁请求，即被阻塞
      or (    sn.sid = m.sid                         --不存在锁请求，但是锁定的对象被其他会话请求锁定
          and m.request = 0
          and lmode != 4
          and (id1, id2) in (
                        select s.id1, s.id2
                          from v$lock s
                         where request != 0 and s.id1 = m.id1
                               and s.id2 = m.id2)
         )
order by id1, id2, m.request;

通过以上查询知道了sid和 serial#就可以开杀了
   alter system kill session 'sid,serial#';