List Memory Allocations for RAC Sessions

SET PAGESIZE 300
SET LINESIZE 300

COLUMN inst_id FORMAT 9
COLUMN username FORMAT A20
COLUMN module FORMAT A40
COLUMN program FORMAT A40

SELECT a.inst_id,
       NVL(a.username,'(oracle)') AS username,
       a.module,
       a.program,
       Trunc(b.value/1024) AS memory_kb
FROM   gv$session a,
       gv$sesstat b,
       gv$statname c
WHERE  a.sid = b.sid
AND    a.inst_id = b.inst_id
AND    b.statistic# = c.statistic#
AND    b.inst_id = c.inst_id
AND    c.name = 'session pga memory'
AND    a.program IS NOT NULL
ORDER BY b.value DESC;