Can we dedidate only 3 physical procs to db on a 4 quad-core procs machine?

Hi,
I have couple of question and will appreciate if anyone has any comments on them.
1) Is there any way I can dedicate only 3 processors to Oracle database on a 4-quad core processor machine. In other words, all four should be available to OS but only 3 to Oracle database.
2) Assuming step1 is possible, can the 4th processor be turned on anytime in future?
Thank you,
--MM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

Thanks for quick reply Jim.
When you said hard partitioning, do you mean by virtual servers?
Why do you want to do this?The reason for my dilemma is we only have 4-CPU license on a standard edition. Since Standard edition doesn't allow Data Guard we are relying on some scripts to send the archivelogs to another machine (where database is already stored and then apply them thru a cron) as a standby server.
What I am trying to achieve iis share the # licenses between the two servers until we buy some more licenses. My initial thought was even though both servers are quad quad-core servers, I will enable (if there is a way) only two on server1 and two on server2. This way I am not offending Oracle licensing terms.
Most operating systems are good at sharing work around multiple processors nowadays.I am bit confused on this. Can you please be little more specific on "sharing work around on multiple processors" or a website link where I can do some more research would be terrific.
Thanks a bunch.
--MM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

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