查看pga使用

select s.username username,s.serial# serial,se.sid,n.name,

       max(se.value) maxmem

from v$sesstat se,

     v$statname n,

     v$session s

where n.statistic# = se.statistic#

and s.sid=se.sid

and s.username is not null

group by n.name,se.sid,s.username,s.serial#

order by 2