How to solve ora-00054 error while drop the constraint

Question

i am trying to drop the constraint for the table but it will give the below error.
ora-00054 resource busy and acquire.
can you please tell me solve this problem. but in my pc i am not using that table at any where in the system.
ALTER TABLE EIIS_JBWSTOCK
DROP CONSTRAINT CHK_TRAN_JOB_TYPE;
this is my code for alter table constraint.
thanks

Answer 1

You may find <sid, serial#> and kill the session.
SELECT c.owner,
       c.object_name,
       c.object_type,
       b.SID,
       b.serial#,
       b.status,
       b.osuser,
       b.machine
  FROM v$locked_object a, v$session b, dba_objects c
WHERE b.SID = a.session_id AND a.object_id = c.object_id; --You may add extra condition for your table.
ALTER SYSTEM KILL SESSION '<sid, serial#>'