SQL Queries : Who is taking all the cpu ?

column sid for 999;
column os_user format a15;
column logon_time format a15;
rem Query vraagt om unix proces id en geeft oracle SID
select s.sid SID, s.osuser OS_USER, s.status STATUS,p.spid OS_PID,
to_char(s.logon_time, 'DD-MON-YYYY HH24:MI:SS') LOGIN_TIME,
s.program PROGAMMA
from v$session s, v$process p
where s.paddr = p.addr
and p.spid='&nr'
/
rem Query vraagt om oracle SID en geeft unix process id
select p.spid PROCESS, s.osuser OS_USER, s.status STATUS,s.sid SID,
to_char(s.logon_time, 'DD-MON-YYYY HH24:MI:SS') login_time,
s.program PROGRAM
from v$session s, v$process p
where s.paddr = p.addr
and s.sid='&nr'