By Keng Siau (Editor)
The e-book offers the newest examine principles and issues on tips to increase present database structures, increase info garage, refine present database types, and boost complex purposes. It presents insights into very important advancements within the box of database and database administration. With emphasis on theoretical matters relating to databases and database administration, the e-book describes the features and contours of recent applied sciences and methodologies, and addresses the wishes of database researchers and practitioners. *Note: This e-book is a part of a brand new sequence entitled "Advanced subject matters in Database Research". This booklet is quantity 3 inside this sequence (Vol. III, 2004)"
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Additional info for Advanced Topics in Database Research (vol. 4)
6 seconds. 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.
According to the simulation experiments, it is possible to state the restructuring of AllocateCircuit as being highly beneficial while the restructuring of AllocateLines is not. In fact, the restructuring of AllocateLines would not result in effective elapsed time saving of activity instances. Consequently, the modeling of a business process by a hierarchy of activity patterns must present restructuring opportunities. Nevertheless, these restructuring opportunities must enable a considerable amount of saved elapsed time when activities are running on a disturbed environment.
We say that a node ndi is reachable from another node ndj if there is a path from ndi to nd j . Definition 2 (reachability) Let G = < N, E > be an activity flow graph. For any two nodes ndi, ndj ∈N, ndj is reachable from ndi, denoted by ndi *→ ndj, if and only if one of the following conditions is verified: (1) ndi = ndj. (2) ndi → ndj∈ E. (3) ∃ nd k ∈ N, ndk ≠ nd i and ndk ≠ ndj such that ndi *→ ndk and ndk *→ nd j . A node ndj is said to be directly reachable from a node ndi if the condition (2) in Definition 2 is satisfied.