查看session io

select b.username, a.*
  from v$sess_io a, v$session b
 where a.sid in
       (select x.sid
          from v$session x
         where x.status = 'ACTIVE'
           and x.PADDR not in (select paddr from v$bgprocess))
   and a.sid = b.sid
   and username is not null
   and username <> 'SYS'