Use more than 2 GB ram for oracle

I have 16 GB ram but I only can use 2 GB of that for oracle database , how can i increase that ???

Don't merely go for increasing the size for Oracle (SGA) Memory. You need to keep collect the usage/statistics of your Oracle SGA, for any contention/or slow performance.
Until and unless users/clients reports that their reports/programs/queries are running slow, then think of increasing memory for Oracle. Moreover, instead of anticipating that the user reports the problem, you from your side need to check the hits of the memory allocated for Oracle.
By the way, you didn't specify your Database Version and OS Details.
If assumed, you are on Oracle 10g, then please take a look at the below Oracle Documentations links.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/create.htm#ADMIN00207
Regards,
Sabdar Syed.

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