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If you have a 64-bit OS, it is best to use a 64-bit database to take advantage of the OS features.
It is best to use the latest version of the database available (11gR2) - so you will need to install 11gR2 in a new ORACLE_HOME and perform an upgrade
It's up to you.
Consider that 64bit can address a much larger memory space.
user10876897 wrote:Don't understand
... oracle 10g release 2 63 bit ...
Thanks for your reply.