Locked Session in Oracle

Select L.Session_Id||','||V.Serial# Sid_Serial,
       L.Oracle_Username Ora_User,
       O.Object_Name,
       O.Object_Type,
       Decode(L.Locked_Mode,
          0, 'None',
          1, 'Null',
          2, 'Row-S (SS)',
          3, 'Row-X (SX)',
          4, 'Share',
          5, 'S/Row-X (SSX)',
          6, 'Exclusive',
          To_Char(L.Locked_Mode)
       ) Lock_Mode,
       O.Status,
       To_Char(O.Last_Ddl_Time,'dd.mm.yy') Last_DDL
From Dba_Objects O, Gv$Locked_Object L, V$Session V
Where O.Object_Id = L.Object_Id
      And L.Session_Id=V.Sid
Order By 2,3;

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ALTER SYSTEM KILL SESSION  'SID,SERIAL'; ( '633,857' );