Verifique las sesiones de la base de datos Oracle
select osuser, username, machine, program
from v$session
order by osuser
Alex Latorre
select osuser, username, machine, program
from v$session
order by osuser-- Sessions by user
select username Usuario_Oracle, count(username) Numero_Sesiones
from v$session
group by username
order by Numero_Sesiones desc-- Order sessions by app
select program Aplicacion, count(program) Numero_Sesiones
from v$session
group by program
order by Numero_Sesiones desc