Best hardware for oracle

I have oracle database that contain more than 70,000,000 recoreds
my oracle is 9i .
my os is microsoft windows server 2003 .
which kind of hardware i need for having good performance ?

I can advice using partitioning to improve delete operations if it is possible.
From my experience, SQL tuning is better then increasing CPU, memory, even better then RAC... if it is possibel too :)
Finally, for hardware advice, you should monitor sys.v_$system_event in order to determine what is the wait event most painfull.
If it is an event related to I/O, then i will suggest improving I/O performance, by spreading IO to many more disk. How much working HD Head you got, that much performance is you have. Also you should configure your storage LUN and partitions in order to balance I/O on all disks.
If it is an event related to memory, then better to add much memory as possible and try to play with memory parameters. However, determining what consumes memory is impotant. Let say if you have many more sessions consumes little memories, then maybe using pooled connection will solve your problem.
Good luck

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