Optimal SGA Settings

Hi All,
I have been provided with a 16GB RAM, 4 Processor on a 64Bit Windows Server to improve the performance of a DB that currently resides on 3GB RAM, 2 Processor on a 32Bit Windows Server.
I have set the SGA parameters as follows. I am yet to find any drastic improvement in performance.
Please suggest any changes that can improve the performance.
SQL> select * from v$sgainfo;
NAME                                  BYTES RES
Fixed SGA Size                      2186400 No
Redo Buffers                       12333056 No
Buffer Cache Size                6979321856 Yes
Shared Pool Size                  503316480 Yes
Large Pool Size                    67108864 Yes
Java Pool Size                     33554432 Yes
Streams Pool Size                  33554432 Yes
Shared IO Pool Size                       0 Yes
Granule Size                       33554432 No
Maximum SGA Size                 1.1725E+10 No
Startup overhead in Shared Pool   167772160 No
Free SGA Memory Available        4093640704
12 rows selected.
SQL> show parameter buffer
NAME                                 TYPE        VALUE
buffer_pool_keep                     string
buffer_pool_recycle                  string
db_block_buffers                     integer     0
log_buffer                           integer     11853824
use_indirect_data_buffers            boolean     FALSE
SQL> show parameter cache
NAME                                 TYPE        VALUE
client_result_cache_lag              big integer 3000
client_result_cache_size             big integer 0
db_16k_cache_size                    big integer 0
db_2k_cache_size                     big integer 0
db_32k_cache_size                    big integer 0
db_4k_cache_size                     big integer 0
db_8k_cache_size                     big integer 0
db_cache_advice                      string      ON
db_cache_size                        big integer 0
db_flash_cache_file                  string
db_flash_cache_size                  big integer 0
db_keep_cache_size                   big integer 0
db_recycle_cache_size                big integer 0
object_cache_max_size_percent        integer     10
object_cache_optimal_size            integer     102400
result_cache_max_result              integer     5
result_cache_max_size                big integer 28768K
result_cache_mode                    string      MANUAL
result_cache_remote_expiration       integer     0
session_cached_cursors               integer     50
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for 64-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - ProductionRegards,
Sam

Hi,
I spoke my sys admin and he is pretty sure that we have a dedicated server and that network bandwidth is hardly being utilized.
I shall go thru the note ID you have shared.
I have following query outputs and I wonder if the RAM (16GB) in my server is properly utilized by oracle.During installation I had assigned 12GB of RAM for SGA.
Microsoft Windows [Version 6.0.6002]
Copyright (c) 2006 Microsoft Corporation.  All rights reserved.
C:\>sqlplus / as sysdba
SQL*Plus: Release 11.2.0.1.0 Production on Tue May 3 11:58:38 2011
Copyright (c) 1982, 2010, Oracle.  All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> SELECT DECODE(value, NULL, 'PFILE', 'SPFILE') "Init File Type" FROM sys.v_$
parameter WHERE name = 'spfile';
Init F
SPFILE
SQL>select * from v$sgainfo;
NAME                             BYTES                  RESIZEABLE
Fixed SGA Size                   2186400                No        
Redo Buffers                     12333056               No        
Buffer Cache Size                6845104128             Yes       
Shared Pool Size                 603979776              Yes       
Large Pool Size                  100663296              Yes       
Java Pool Size                   33554432               Yes       
Streams Pool Size                33554432               Yes       
Shared IO Pool Size              0                      Yes       
Granule Size                     33554432               No        
"Maximum SGA Size                 11725017088            No      "  
Startup overhead in Shared Pool  167772160              No        
"Free SGA Memory Available        4093640704 "                      
12 rows selected
SQL> select * from V$SGA_DYNAMIC_FREE_MEMORY;
CURRENT_SIZE          
4093640704  
SQL>select * from v$SGA_TARGET_ADVICE;
SGA_SIZE               SGA_SIZE_FACTOR        ESTD_DB_TIME           ESTD_DB_TIME_FACTOR    ESTD_PHYSICAL_READS   
1832                   0.25                   4116597                1.9513                 555938014             
2748                   0.375                  3460068                1.6401                 483715140             
3664                   0.5                    3214503                1.5237                 457165083             
4580                   0.625                  2794889                1.3248                 410853719             
5496                   0.75                   2603121                1.2339                 390218612             
6412                   0.875                  2273379                1.0776                 353787902             
7328                   1                      2109669                1                      336076662             
8244                   1.125                  1911152                0.9059                 314198071             
9160                   1.25                   1814740                0.8602                 303914125             
10076                  1.375                  1654827                0.7844                 286135670             
10992                  1.5                    1590904                0.7541                 279414137             
11908                  1.625                  1509048                0.7153                 270172029             
12824                  1.75                   1466011                0.6949                 265769424             
13740                  1.875                  1424029                0.675                  261333212             
14656                  2                      1424029                0.675                  261333212             
15 rows selected
SQL> show parameter memory
NAME                                 TYPE        VALUE
hi_shared_memory_address             integer     0
memory_max_target                    big integer 1G
memory_target                        big integer 1G
shared_memory_address                integer     0
SQL> show parameter sga
NAME                                 TYPE        VALUE
lock_sga                             boolean     FALSE
pre_page_sga                         boolean     FALSE
"sga_max_size                         big integer 1G"
"sga_target                           big integer 0"
SQL> show parameter buffer
NAME                                 TYPE        VALUE
buffer_pool_keep                     string
buffer_pool_recycle                  string
db_block_buffers                     integer     0
log_buffer                           integer     5324800
use_indirect_data_buffers            boolean     FALSE
SQL> show parameter cache
NAME                                 TYPE        VALUE
client_result_cache_lag              big integer 3000
client_result_cache_size             big integer 0
db_16k_cache_size                    big integer 0
db_2k_cache_size                     big integer 0
db_32k_cache_size                    big integer 0
db_4k_cache_size                     big integer 0
db_8k_cache_size                     big integer 0
db_cache_advice                      string      ON
db_cache_size                        big integer 0
db_flash_cache_file                  string
db_flash_cache_size                  big integer 0
db_keep_cache_size                   big integer 0
db_recycle_cache_size                big integer 0
object_cache_max_size_percent        integer     10
object_cache_optimal_size            integer     102400
result_cache_max_result              integer     5
result_cache_max_size                big integer 2624K
result_cache_mode                    string      MANUAL
result_cache_remote_expiration       integer     0
session_cached_cursors               integer     50Regards,
Sam

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