By Keng Siau (Editor)
The e-book offers the most recent examine rules and issues on easy methods to improve present database structures, increase details garage, refine current database types, and improve complicated functions. It presents insights into vital advancements within the box of database and database administration. With emphasis on theoretical concerns relating to databases and database administration, the ebook describes the services and lines of recent applied sciences and methodologies, and addresses the desires 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 e-book is quantity 3 inside of this sequence (Vol. III, 2004)"
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Extra info for Advanced Topics in Database Research (vol. 4)
Let AD( α) denote a set of activity dependencies specified in α, children(α) denote the set of child activity patterns of α and Pattern(A) denote the activity pattern of activity A. An activity A is said to be a TAM activity if and only if it satisfies the following conditions: • • • ∃α ∈ Σ, Pattern(A) = α. ∀P ∈ AD(α), P(A) = true. ∀C ∈ children (A), A ~> C is a TAM activity. Another property of an activity hierarchy is the visibility of objects between activities. The visibility of an activity refers to its ability to see the results of other activities while it is executing.
As such, the specific settings used in the simulator are less important than the way in which a delay is either hidden or not hidden by the restructuring process. In the experiments, the various delays were generated by simply applying a uniform probabilistic function. Consider the values in Table 2 as an example. The typical elapsed time for each activity instance is the average of Min and Max values. It is more realistic to represent the elapsed time of activity instances as random values within a time interval because two instances of the same activity can perform a different number of I/O operations, demand a different amount of data from or to the network connection, and execute different sets of CPU operations.
Another property of an activity hierarchy is the visibility of objects between activities. The visibility of an activity refers to its ability to see the results of other activities while it is executing. A child activity AC has access to all objects that its parent activity AP can access; that is, it can read objects that AP has modified (Liu & Pu, 1998b). TAM uses the multiple object version schemes (Nodine & Zdonik, 1990) to support the notion of visibility in the presence of concurrent execution of activities.