Business Logic and Application Service
Business application architecture has changed over the past two decades from monolithic, centrally hosted applications to a multitiered, distributed model. Data, business logic, presentation, and user access are divided into separate components. This division increases manageability, but it does not remove the need to make each component highly available. End-to-end application availability depends on the product of the availability metrics for each component.
Two types of application servers are commonly found in an enterprise. The first type is application servers that are built into packages like SAP and Oracle applications; the second type is the more general-purpose application servers, such as the ...
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