Explain why the three-level organization of a transaction processing system (including transaction servers) is said to be scalable to large enterprise-wide systems. Discuss issues of cost, security, maintainability, authentication, and authorization.
What will be an ideal response?
Authentication: Can be performed on a dedicated serve.r
Authorization: Can be quite specific at the transaction level.
Cost: As the number of users increase, additional servers can be added as needed.
Security: Applications procedures are more secure on a application server. Transaction
procedures are more secure on a transaction server.
Maintainability: Application procedures reside in a single place and hence can be
updated more easily.
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