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Scaling for E-Business by Virgilio A. F. Almeida, Daniel A. Menascé

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8.4. Service Time and Service Demand

An e-commerce transaction has been defined as a request from a customer to execute one of the functions provided by the e-business site. Consider any resource i used by an e-commerce transaction. There are different levels of resources. We may be looking at high-level resources such as payment and authentication servers. Or we may be interested in low-level resources, such as the processor and the disks of a server or a LAN segment, or even a router. A transaction may need to visit resource i several times before it completes. For example, a Browse transaction may need to perform several I/O operations at certain disks, use the CPU at the database server several times, and use various networks to carry the ...

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