By Mario Piattini
Here's a thorough creation to the newest advancements in database structures layout awarded from an functions perspective. that includes contributions from recognized specialists within the box, this new booklet can pay exact consciousness to matters raised by way of new tendencies in database layout, and the way those advancements have an effect on the programmer and database administrator. The authors and editors current techniques in an intuitive and motivating demeanour, making broad use of examples, and together with lists of references for added research with each one bankruptcy.
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Extra info for Advanced Database Technology and Design
3 The Active Function With the active function, the system performs actions that modify the state of the domain. To perform the active function, the system must know the actions it can take, when those actions can be taken, and their effect on the state of the domain. The active function also has the two execution modes. In the on request mode, users delegate to the system the taking of some action that may modify the state of the domain. For example, users may ask the system to calculate the interests to be paid to bank accounts and charge them to the accounts balances.
These characteristics are important, but they do not change the fact that real-time systems may be seen as ISs. 1 reviewed the main functions of an IS. To be able to perform those functions, an IS requires some knowledge about its domain. The main objective of conceptual modeling is the elicitation and formal definition of the general knowledge about a domain that an IS needs to know to perform the required functions. This section describes the kinds of knowledge required by most ISs. The line of reasoning we will follow is this: • If the memory function of an IS has to maintain a representation of the state of the domain, then we must define which is the concrete state that must be represented.
No customer has bought more than 200 books. 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.