To check the Top Sessions


select
ash.session_id,
ash.session_serial#,
ash.user_id,
ash.program,
sum(decode(ash.session_state,’ON
CPU’,1,0))     “CPU”,
sum(decode(ash.session_state,’WAITING’,1,0))    –
sum(decode(ash.session_state,’WAITING’,
decode(en.wait_class,’User
I/O’,1, 0 ), 0))    “WAITING” ,
sum(decode(ash.session_state,’WAITING’,
decode(en.wait_class,’User
I/O’,1, 0 ), 0))    “IO” ,
sum(decode(session_state,’ON
CPU’,1,1))     “TOTAL”
from
v$active_session_history ash,
v$event_name
en
where
en.event# = ash.event# and rownum<11
group
by session_id,user_id,session_serial#,program
order
by sum(decode(session_state,’ON CPU’,1,1));
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