By Siau K.

ISBN-10: 1591404711

ISBN-13: 9781591404712

ISBN-10: 1591404738

ISBN-13: 9781591404736

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T is created by assigning a flow instance identifier and carrying out the following steps to fire the begin node bn(T): • • • set the state of node bn(T) to be fired; set all the outgoing edges of bn(T) to be signaled; perform a node instantiation for each node that is directly reachable from the begin node bn(T). A node can be instantiated or triggered when all the incoming edges of the node are signaled, its trigger condition is evaluated to be true. When a node is triggered, a unique activity instance identifier is assigned, and the node state is set to fired.

These values were chosen considering two types of disturbances: (1) those caused by computing systems with lower computational power and (2) those caused by delays on network connections. The first type corresponds to the effect on replacing a computer by a low spare system. For this type, we adopted three different elapsed time increasing: 20%, 50%, and 100% for both controlled activities. We consider that a typical delay of 20% on the average elapsed time represents a computing system with a similar performance to the original one.

04 seconds for each second of delay in the average elapsed time of A2 instances). 3. 08 as the growth factor. 0 mean that the computing environment still presents availability to perform more WI. 0 point to show an overloaded environment. Moreover, the point where the line shows 60 seconds for average WI elapsed time is 73%. Hence, disturbances that cause delays on A2 instances up to 73% are properly managed if B workflow restructuring takes place at start. Similarly to Figure 18, the dashed line in Figure 19 plots the average WI elapsed time of TeleConnect WI without restructuring for delays in A6 instances.

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Advanced Topics In Database Research by Siau K.


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