You will have to pay attention to how each component of the SGA performs to decide the optimal size. The Oracle...
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Performance Tuning Guide for your version has details on how to do just this. Please look for this document here.
Oracle 10g does help by letting you devote a chunk of memory to the total SGA and then managing the individual components within the SGA for you. Simply set the SGA_TARGET parameter and Oracle will take care of the rest for you. As a rule of thumb, Oracle Corp. is recommending that you set SGA_TARGET to one-third of your database server's physical memory.
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