Minimized SGA Setting for Enterprise Manager DB Console

Oracle 11g occupy lots of memory.
Based on my experience 9i requires 60m, 10g requires 80m, 11g requires 100m at least.

Without Enterprise Manager DB Console

NAME                                  BYTES RES
-------------------------------- ---------- ---
Fixed SGA Size                      1331404 No
Redo Buffers                        2641920 No
Buffer Cache Size                   8388608 Yes
Shared Pool Size                   71303168 Yes
Large Pool Size                           0 Yes
Java Pool Size                            0 Yes
Streams Pool Size                         0 Yes
Shared IO Pool Size                       0 Yes
Granule Size                        4194304 No
Maximum SGA Size                   92057600 No
Startup overhead in Shared Pool    33554432 No
Free SGA Memory Available           8388608

With running Enterprise Manager DB Console
NAME                                  BYTES RES
-------------------------------- ---------- ---
Fixed SGA Size                      1331992 No
Redo Buffers                        2445312 No
Buffer Cache Size                  33554432 Yes
Shared Pool Size                  104857600 Yes
Large Pool Size                           0 Yes
Java Pool Size                     25165824 Yes
Streams Pool Size                         0 Yes
Shared IO Pool Size                       0 Yes
Granule Size                        4194304 No
Maximum SGA Size                  184135680 No
Startup overhead in Shared Pool    33554432 No
Free SGA Memory Available          16777216

Actually, it consumes 198m os memory before db console connected and 286m after db console connected.