How To Get CPU/Memory Usage for each session

 Show CPU Usage for Active Sessions


SET PAUSE ON
SET PAUSE 'Press Return to Continue'
SET PAGESIZE 60
SET LINESIZE 300

COLUMN username FORMAT A30
COLUMN sid FORMAT 999,999,999
COLUMN serial# FORMAT 999,999,999
COLUMN "cpu usage (seconds)" FORMAT 999,999,999.0000

SELECT
s.username,
t.sid,
s.serial#,
SUM(VALUE/100) as "cpu usage (seconds)"
FROM
v$session s,
v$sesstat t,
v$statname n
WHERE
t.STATISTIC# = n.STATISTIC#
AND
NAME like '%CPU used by this session%'
AND
t.SID = s.SID
AND
s.status='ACTIVE'
AND
s.username is not null
GROUP BY username,t.sid,s.serial#
/


Show Memory  Usage for Active Sessions


SELECT to_char(ssn.sid, '9999') || ' - ' || nvl(ssn.username, nvl(bgp.name, 'background')) ||' - '||
nvl(lower(ssn.machine), ins.host_name) "SESSION",
to_char(prc.spid, '999999999') "PID/THREAD",
to_char((se1.value/1024)/1024, '999G999G990D00') || ' MB' " CURRENT SIZE",
to_char((se2.value/1024)/1024, '999G999G990D00') || ' MB' " MAXIMUM SIZE"
FROM v$sesstat se1, v$sesstat se2, v$session ssn, v$bgprocess bgp, v$process prc,
v$instance ins, v$statname stat1, v$statname stat2
WHERE se1.statistic# = stat1.statistic# and stat1.name = 'session pga memory'
AND se2.statistic# = stat2.statistic# and stat2.name = 'session pga memory max'
AND se1.sid = ssn.sid
AND se2.sid = ssn.sid
AND ssn.paddr = bgp.paddr (+)
AND ssn.paddr = prc.addr (+);


Show Memory Usage for Single Session:


SELECT to_char(ssn.sid, '9999') || ' - ' || nvl(ssn.username, nvl(bgp.name, 'background')) ||' - '||
nvl(lower(ssn.machine), ins.host_name) "SESSION",
to_char(prc.spid, '999999999') "PID/THREAD",
to_char((se1.value/1024)/1024, '999G999G990D00') || ' MB' " CURRENT SIZE",
to_char((se2.value/1024)/1024, '999G999G990D00') || ' MB' " MAXIMUM SIZE"
FROM gv$sesstat se1, gv$sesstat se2, gv$session ssn, gv$bgprocess bgp, gv$process prc,
gv$instance ins, gv$statname stat1, gv$statname stat2
WHERE se1.statistic# = stat1.statistic# and stat1.name = 'session pga memory'
AND se2.statistic# = stat2.statistic# and stat2.name = 'session pga memory max'
AND se1.sid = ssn.sid
AND se2.sid = ssn.sid

AND SSN.sid='&i'
AND ssn.paddr = bgp.paddr (+)
AND ssn.paddr = prc.addr (+);


For reference Oracle Meta Link Doc ID: 2294337.1

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