The UGA, or User Global Area, is allocated in the PGA for each session connected to Oracle in a dedicated server environment.
The PGA is memory allocated at the client to hold a stack which contains all of the session's variables, etc
SET LINESIZE 200
SET PAGESIZE 9999
COLUMN sid FORMAT 999 HEADING 'SID'
COLUMN oracle_username FORMAT a12 HEADING 'Oracle User' JUSTIFY right
COLUMN os_username FORMAT a9 HEADING 'O/S User' JUSTIFY right
COLUMN session_program FORMAT a11 HEADING 'Session Program' TRUNC
COLUMN session_machine FORMAT a8 HEADING 'Machine' JUSTIFY right TRUNC
COLUMN session_pga_memory FORMAT 9,999,999,999 HEADING 'PGA Memory'
COLUMN logon_time FORMAT 9,999,999,999 HEADING 'logon_time'
COLUMN session_pga_memory_max FORMAT 9,999,999,999 HEADING 'PGA Memory Max'
COLUMN session_uga_memory FORMAT 9,999,999,999 HEADING 'UGA Memory'
COLUMN session_uga_memory_max FORMAT 9,999,999,999 HEADING 'UGA Memory MAX'
SELECT
lpad(s.username,12) oracle_username
, lpad(s.osuser,9) os_username
, s.program session_program
, s.status active
, s.logon_time logon_time
, lpad(s.machine,8) session_machine
, (select ss.value from v$sesstat ss, v$statname sn
where ss.sid = s.sid and
sn.statistic# = ss.statistic# and
sn.name = 'session pga memory') session_pga_memory
, (select ss.value from v$sesstat ss, v$statname sn
where ss.sid = s.sid and
sn.statistic# = ss.statistic# and
sn.name = 'session pga memory max') session_pga_memory_max
, (select ss.value from v$sesstat ss, v$statname sn
where ss.sid = s.sid and
sn.statistic# = ss.statistic# and
sn.name = 'session uga memory') session_uga_memory
, (select ss.value from v$sesstat ss, v$statname sn
where ss.sid = s.sid and
sn.statistic# = ss.statistic# and
sn.name = 'session uga memory max') session_uga_memory_max
FROM
v$session s
ORDER BY session_pga_memory DESC
/
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