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ORA-27101: shared memory realm does not exist

Yesterday evening,  When i tried to increase my SGA size in Oracle 9i on 32 bit Windows server 2003, It shows ORA-27101: shared memory realm does not exist and Out of memory.I am aware of this error.

I tried to fix this error like I just added 3gb switch on boot.ini file and then I just shutdown the server and up again. the database working properly. where you can find this boot.ini file on windows server 2003.

Note : windows 2000 not applicable.

After added 3gb switch, I can increase SGA max size manually and other components of SGA size also.

What is 3gb switch and How to set up?