Virtual Address Space
NT allocates 4GB of address space for each application with 2GBs reserved for
the operating system and 2GBs reserved for the application. Windows 2000 and NT4
SP3 or later allow you to change the 2/2 split to 1GB for the operating system
and 3 GBs for the application. This would obviously benefit SQL server or Oracle
databases. If you have a large amount of memory and an application that can
benefit from changing the 2/2 default, you add the parm /3GB
to boot options lines in BOOT.INI.