By Mario Piattini
Here's a thorough creation to the most recent advancements in database platforms layout provided from an functions perspective. that includes contributions from famous specialists within the box, this new publication can pay specific consciousness to matters raised by means of new traits in database layout, and the way those advancements have an effect on the programmer and database administrator. The authors and editors current thoughts in an intuitive and motivating demeanour, making vast use of examples, and together with lists of references for added learn with each one bankruptcy.
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Extra info for Advanced Database Technology and Design
1 summarizes the examples of the three functions and the two execution modes. 4 Examples of ISs All conventional ISs perform a memory function and some informative function. We will not describe any concrete examples, since they are well known, and identification of the functions they perform is simple. However, it may be worthwhile to comment on some particular classes of systems and to see that, even if one might doubt whether they are ISs, they in fact perform the functions we have seen in this section.
In the mode autonomously, users delegate to the system the taking of some action that may modify the state of the domain, when some condition is satisfied. The system will monitor the state of the domain, and when the condition is fulfilled, it will perform the delegated action. The nature of actions that may be delegated to the system (in both execution modes) are varied. It may be a simple and well-defined action or one for which only the objectives are defined, leaving autonomy to the system on how to achieve those objectives.
A concept has an extension and an intension. The extension of a concept is the set of its possible instances, while the intension is the property shared by all its instances. As human beings, we use the concepts we have to structure our perception of a domain. In that sense, concepts are like eyeglasses with which we observe a domain. Concepts allow us to classify the things we perceive as 36 Advanced Database Technology and Design exemplars of concepts we have. In other words, what we observe depends on the concepts we use in the observation.