Monitorar Sessão with high Physical Reads

set linesize 120
col osuser format a10
col username format 10
select
OSUSER osuser,
username,
PROCESS pid,
ses.SID sid,
SERIAL#,
PHYSICAL_READS,
BLOCK_CHANGES
from v$session ses,
v$sess_io sio
where ses.SID = sio.SID
order by PHYSICAL_READS;