Based on v$session.state, no session is "ON CPU" ????

Question

Hello all,
v$session.state never equal to "ON CPU", what does it mean ?
No session is on CPU ???
v$session.state values possible = WAITED KNOWN TIME or WAITED SHORT TIME or WAITING
But not "ON CPU", so maybe NEVER any session is on CPU ????
My aim is to sho the "state" of current "ACTIVE" session ( like "waiting", "working"), and I suffer a little because based on v$session ALL SESSIONS are in WAIT !!!!
Thanks in advance.

Answer 1

As Hermant has already pointed out, the "STATE" column in v$session can have 3 values
(a) waiting
(b) waited known time
(c) waited short time
So if you want to have a more appropriate picture of what you sessions are doing then you can use the following query to get what you want
select
   decode(state, 'WAITING', event, 'ON CPU')
  ,count(*)
from v$session
where status = 'ACTIVE'
and username is not null
group by decode(state, 'WAITING', event, 'ON CPU')
order by count(*) desc;
SELECT  username
      , schemaname
      , DECODE (state, 'WAITING', event, 'ON CPU')
      , osuser
      , machine
      , program
      , sql_id
      , prev_sql_id
      , module
      , action
      ,client_info
  FROM v$session v
WHERE status = 'ACTIVE'
AND username IS NOT NULL;Best regards
Mohamed Houri
www.hourim.wordpress.com