You can find material on STATSPACK in the the Oracle9i documentation (10g favors the use of the Automatic Workload Repository) or on MetaLink and TechNet. MetaLink Note:232443.1 is worthwhile, as is this article on enhancements to STATSPACK for Oracle9iR2. I'd recommend searching TechNet and/or MetaLink to find articles relevant to the version you're running.
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