kill blocking session on object

How to kill blocking session on object ?

STEP1:
Initially we need to find out blocking session on object 

SELECT o.owner, o.object_name, o.object_type, o.last_ddl_time, o.status, l.session_id, l.oracle_username, l.locked_mode
FROM dba_objects o, gv$locked_object l
WHERE o.object_id = l.object_id and o.object_name='EMP';

STEP2:
In order to kill holding session we need to find out serial#:
SQL> select SERIAL# from v$session where SID=890;

STEP3:
Basic syntax to kill session 
SQL>  alter system kill session 'sid, serial#';

----Nikhil Tatineni--
----Oracle in memory--