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SELECT /*+ rule */
       s.username,
       DECODE (l.TYPE,
               'TM', 'TABLE LOCK',
               'TX', 'ROW LOCK',
               NULL
              ) lock_level, o.owner, o.object_name, o.object_type, s.SID,
       s.serial#, s.terminal, s.machine, s.program, s.osuser
  FROM v$session s, v$lock l, dba_objects o
 WHERE l.SID = s.SID AND l.id1 = o.object_id(+) AND s.username IS NOT NULL