By Mario Piattini
An advent to advancements in database structures layout provided from an functions perspective. that includes contributions from specialists within the box, it will pay specified recognition to concerns raised via new developments in database layout, and the way those advancements impact the programmer and database administrator.
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Health personnel need different types of information about their patients. Such information could be distributed to different medical centers. Security concerns are also high in this type of IS. Digital publication. The publishing sector is going through big changes due to the development of electronic books, which combine text with audio, video, and images. Education and training. In distance learning processes, multimedia courses require data in real time and in an Internet or intranet environment.
The state of a particular domain, at a given time, consists, then, of a set of objects, a set of relationships, and a set of concepts into which those objects and relationships are classified. For example, in the domain of a company, we may have the concepts of Customer, Product, and Sale. Those concepts are usually stable. On the other hand, at a given instant, we have objects classified as customers, objects classified as products, and relationships between customers and products classified as sales.
2 Information Base An information base is a description of the entities and relationships of a domain that are represented in the IS . In principle, this description could be done in any language, but usually it is done in a logic-based language. Sometimes, the description of an entity or a relationship is called a fact, and we say that the information base contains the facts about a domain. For example, if we use the language of first-order logic as the modeling language, we could have a schema formed by predicates Person, Book, and Reads, which represent entity types Person and Book and relationship type Reads.