increased my os ram to 16G, how do i increase the memory to oracle

I am running windows server 2003 enterprise edition and have up'ed my RAM to 16G (showing on my computer properties as 16G)
how do i allocate some of this to oracle 11g AMM?

i have  tried to increase using the;
ALTER SYSTEM SET MEMORY_MAX_TARGET=6G SCOPE=SPFILE;
ALTER SYSTEM SET MEMORY_TARGET=5G SCOPE=SPFILE;
ALTER SYSTEM SET PGA_AGGREGATE_TARGET=0 SCOPE=SPFILE;
ALTER SYSTEM SET SGA_TARGET=0 SCOPE=SPFILE;

and also changing in PFILE(init.ORA) with no luck.

keep getting the out of memory error.
USAISRAsked:
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asavenerCommented:
Please post your boot.ini file; you should have the /3gb and /pae switches enabled:

[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(1)partition(2)\WINNT
[operating systems]
multi(0)disk(0)rdisk(1)partition(2)\WINNT="Microsoft Windows 2000 Server" /fastdetect /3GB /PAE

Now you need to configure Oracle to use the extra memory you've got in there. How Oracle does it is that it "maps" the extra memory through a "window" in the usual memory space. One limitation here is that Oracle can do it only for buffer cache, not shared pool.
So, what you need to set in Oracle is:

USE_INDIRECT_DATA_BUFFERS=TRUE in init.ora  
increase DB_BLOCK_BUFFERS in init.ora (Note: if you use Oracle 9.2 and use DB_CACHE_SIZE instead of DB_BLOCK_BUFFERS, you will get an error starting instance. Comment out DB_CACHE_SIZE and use DB_BLOCK_BUFFERS instead)
You might want to adjust a registry setting in HKLM\Software\Oracle\Homex called AWE_WINDOW_MEMORY. It specifies the size of the "window" that Oracle will use for using the extra memory. See Metalink Note 225349.1 for details on calculating miminum size of this setting.  

http://www.pontis.biz/resources/articles/oracle_on_windows.php

You might find additional information by searching on oracle and pae, or oracle and physical address extension.
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