ORA-00054:resource busy and acquire with nowait specified

1.

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;

 

2.

SELECT   sql_text

    FROM v$session a, v$sqltext_with_newlines b

   WHERE DECODE (a.sql_hash_value, 0, prev_hash_value, sql_hash_value) =

                                                                  b.hash_value

     AND a.SID = &sid

ORDER BY piece;

 

3.ALTER SYSTEM KILL SESSION 'SID, serial#';