Script to find in oracle 10g - lock_tree

SET LINESIZE 500
SET PAGESIZE 1000

COLUMN username FORMAT A15
COLUMN machine FORMAT A25
COLUMN logon_time FORMAT A20

SELECT LPAD(' ', (level-1)*2, ' ') || NVL(s.username, '(oracle)') AS username,
       s.osuser,
       s.sid,
       s.serial#,
       s.lockwait,
       s.status,
       s.module,
       s.machine,
       s.program,
       TO_CHAR(s.logon_Time,'DD-MON-YYYY HH24:MI:SS') AS logon_time
FROM   v$session s
CONNECT BY PRIOR s.sid = s.blocking_session
START WITH s.blocking_session IS NULL;

SET PAGESIZE 14