if you have job process this query would show you which are they

Code:
select
 p.spid thread,
 s.username,
     case
     when p.background is null and s.program is null then bg.description
     when p.background is null then s.program
     when p.background = 1 then bg.description
     end program,
     ss.value/100 CPU,physical_reads disk_io
from  v$process p,
     v$session s,
     v$sesstat ss,
     v$sess_io si,
     v$bgprocess bg
where  s.paddr=p.addr
  and  ss.sid=s.sid
  and  ss.statistic#=12
  and  si.sid=s.sid
  and  bg.paddr(+)=p.addr
order  by ss.value desc
it's sanjay's query modified