查看各个会话占用的内存

SELECT server, s.username, osuser, NAME, VALUE / 1024 / 1024 MB, s.SID,
s.serial#, spid
FROM v$session s, v$sesstat st, v$statname sn, v$process p
WHERE st.SID = s.SID
AND st.statistic# = sn.statistic#
AND sn.NAME
LIKE 'session pga memory'
AND p.addr = s.paddr
ORDER BY VALUE DESC