Large UGA in a Dedicated connections DB

Question

Hi all,
I obtained the total PGA and UGA memory used by current sessions from the query below. All the connections used Dedicated connections.
My question is: Why the UGA is that large (close to total PGA)? Is that normal for a database that doesn't have any Shared Server connection. What's the reason for that?
Oracle 11g R1
Windows 2003 SP2
SQL> SELECT n.name, round(SUM(value)/1024/1024,2) MB
  2  FROM V$SESSTAT s, V$STATNAME n
  3  WHERE s.statistic# = n.statistic#
  4  AND n.name in ('session pga memory')
  5  group by n.name
  6  union
  7  SELECT n.name, round(SUM(value)/1024/1024,2) MB
  8  FROM V$SESSTAT s, V$STATNAME n
  9  WHERE s.statistic# = n.statistic#
10  AND n.name in ('session uga memory')
11  group by n.name
12  ;
NAME                                                         MB
session pga memory                                       816.82
session uga memory                                       782.36

Answer 1

hi
it is normal
PGA Memory
The Program Global Area (PGA) is a memory region that contains data and control information for a single process (server or background). The PGA is made up of the following:
Session Information - (UGA)
A PGA in an instance running without the shared server requires additional memory for the user's session, such as private SQL areas and other information. If the instance is running the shared server, this extra memory is not in the PGA, but is instead allocated in the SGA (the Shared Pool).
Stack Space
A PGA always contains a stack space, which is memory allocated to hold a session's variables, arrays, and other information.
Uga is the bigest area in pga
hope this helps
zekeriya