Stop scratching your head and read this.,
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This review is from: Professional SQL Server 2008 Internals and Troubleshooting (Paperback)
A really good investment, this book paid for its self in the first week. Just think how much hardware costs, then factor in making the most of what you have. It will not make you an expert over-night, but it may solve that issue you are stuck on at the moment. Worth every penny.