Advanced Topics In Database Research by Siau K.

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By Siau K.

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The continuous line in Figure 18 plots average WI elapsed times with B restructuring at the start. In this simulation, all 165 WI are restructured before the start of their A2 instances. The average WI elapsed time grows as A2 delays increase. But its growth factor also increases. 4 seconds, respectively), Copyright © 2005, Idea Group Inc. Copying or distributing in print or electronic forms without written permission of Idea Group Inc. is prohibited. 6 seconds. 04 seconds for each second of delay in the average elapsed time of A2 instances).

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.

The others are rollbacked. We model this requirement using iteration (see Figure 10). By clicking the iteration-type activity node, the information about its subflow will be displayed. The rollback condition is also displayed. In this case, it says that if Figure 10. An example C:ALLOCATELINES is successful, then the using iterator connectors AND-Split type connection node following C:ALLOCATELINES is fired. Then, activities A8:ALLOCATESWITCH and A9:ALLOCATE SWITCH are fired. Otherwise, a new C:ALLOCATELINES instance is fired until the profit level required may be reached.

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