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Download Advanced Topics In Database Research by Siau K. PDF

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By Siau K.

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When considering the workflow models to reflect the organizational structure, among other aspects, the restructuring approach presented in this chapter enables the optimization of a company business process without necessarily reengineering the enterprise. IMPLEMENTATION CONSIDERATIONS We first describe briefly the implementation efforts concerning the ActivityFlow specification language. Then we give an overview of our first prototype system CWf-Flex which utilizes the implementation architecture of the ActivityFlow to provide an execution environment to specify and execute the workflows.

However, deadline control of workflow instances have led to a growing problem that conventional workflow management systems do not address, namely, how to reorganize existing workflow activities in order to meet deadlines in the presence of unexpected delays. Besides, having long-lived business-process instances, workflow designs must deal with schema evolution with the proper handling of ongoing instances. These problems are known as the workflow-restructuring problem. This section describes the notation and issues of workflow restructuring and discusses how a set of workflow activity restructuring operators can be employed to tackle the workflow-restructuring problem on ActivityFlow modeling.

Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. TEAM LinG 22 Liu, Pu and Ruiz activities in the same subflow instance. Second, when using iteration rather than explicitly backward edges, the conditional rollback may be considered as a continuation of the workflow instance execution. We believe that the use of iteration provides a much cleaner graphical notation to model cyclic activity workflows. To reduce the complexity and facilitate the management of conditional rollbacks, the only restriction we place on the conditional rollback is the following: A call to rollback to an activity node ndk can only be accepted if it comes from subactivity nodes or sibling activity nodes of ndk.

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