oracle waiting events

select
  sw.sid||','||sw.serial#, sw.machine, sw.program, sw.wait_event, sw.blocking_session, o.object_name
, (select sql_text from v$sql where sql_id=sw.sql_id and rownum=1) as sql, p.spid
  from (
    select s.*, w.event as wait_event
      from v$session_wait w
      join v$session s on s.sid=w.sid
     start with w.event not in ('SQL*Net message from client', 'rdbms ipc message')
     connect by prior s.blocking_session = w.sid
  ) sw
  left outer join v$process p on p.addr = sw.paddr
  left outer join dba_objects o on o.data_object_id = sw.row_wait_obj#
 order by sw.machine, sw.program, sw.event