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Guru's Guide to SQL Server Architecture and Internals, The by Ken Henderson

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Memory Basics

Memory access is so integral to application architecture and performance that a considerable portion of the Windows infrastructure is devoted to managing it and making it accessible to applications. Effective memory management is key to achieving application performance that is both acceptable and consistent. Despite the relatively low prices of today's RAM modules, memory is still a finite resource and is probably the single most important factor affecting application performance and overall system throughput. In many instances, you'll get a better performance boost from adding RAM to a machine than you will by upgrading to a faster CPU.

Key Memory Terms and Concepts

Process address space— the 4GB address space for an application. ...

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