sql> delete from test where object_id<10;

sql> update test set flag='N' where object_id<10;

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;

USERNAME SID SERIAL# logoN_TIME
------------------------------ ---------- ---------- --------------
LIHUILIN 14 87 09-11月-13
LIHUILIN 139 655 09-11月-13

select
(select username from v$session where sid=a.sid) blocker,
a.sid,' is blocking ',
(select username from v$session where sid=b.sid) blockee,
b.sid
from v$lock a,v$lock b
where a.block=1 and b.request>0 and a.id1=b.id1 and a.id2=b.id2;

BLOCKER SID 'ISBLOCKING' BLOCKEE SID
------------------------------ ---------- ------------- ------------------------------ ----------
LIHUILIN 14 is blocking LIHUILIN 139

select 'alter system kill session '''||sid||','||serial#||''';' cmd from v$session where username='LIHUILIN' and sid=14;

CMD
-----------------------------------------
alter system kill session '14,87';