Select para listar usuarios conectados no oracle

gistfile1.txt

SELECT s.username, s.program, s.logon_time, s.osuser, s.machine
FROM v$session s, v$process p, sys.v_$sess_io si
WHERE s.paddr = p.addr(+)
AND si.sid(+) = s.sid
AND s.username = 'SYSPDVWEB_LANCEUNICO_TEST';