DB Lock in the Oracle Objects

 SELECT object_name, machine, s.sid, s.serial#, s.*

FROM gv$locked_object l, dba_objects o, gv$session s  

WHERE l.object_id = o.object_id

AND l.session_id = s.sid;

Release SESSION SQL:  
--alter system kill session 'sid, serial#';  
ALTER system kill session '23, 1647';