By Mario Piattini
An advent to advancements in database platforms layout provided from an functions perspective. that includes contributions from specialists within the box, it can pay targeted recognition to concerns raised by way of new developments in database layout, and the way those advancements impact the programmer and database administrator.
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Additional info for Advanced Database Technology and Design (Artech House Computer Library) (Artech House Computer Library (Hardcover))
Many times, answering queries posed by users requires some infer- ence capability on the part of the IS. This capability uses derivation rules, which must be defined. Team-Fly® 34 Advanced Database Technology and Design This section develops that line of reasoning. Along the way, we introduce informally the terminology and give an intuitive idea of the basic concepts. 1 Conceptual Schema of the State The objective of the memory function of an IS is to maintain a consistent representation of the state of its domain.
Less frequently, the answer to an extensional query may be intensional. An intensional answer characterizes the state of the domain, but it does not describe the state explicitly . Intensional queries ask about the kinds of information the system knows, rather than particular information , for example, • What do you know about students? • What is the maximum number of courses a student may take simultaneously? • What is a student? 30 Advanced Database Technology and Design The informative function also admits the two execution modes.
An event is any circumstance that happens at a given instant and whose effect is a change in the domain state. , dropping some amount of liquid into a tank or the rising of the sun). It is usually assumed that events are instantaneous, that is, they do not have duration. It is also assumed that an event causes a transition in the domain, from an old state to a new one, without any noticeable intermediate state. In many cases, those assumptions do not pose any particular problems. For example, the process of hiring a new employee takes some time, but it is likely that we are interested only in the outcome of that process: From that moment on, the person will be an employee, which he or she was not at the previous time.