By Mario Piattini
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Extra resources for Advanced Database Technology and Design
C 20 Advanced Database Technology and Design Future DBMSs must manage in an integrated way, not only different types of data and objects but also knowledge. In that respect, research into deductive DBMSs has been carried out (see Chapter 4). Two other important aspects of modern IS that are being incorporated into DBs are time (temporal DBs; see Chapter 5) and uncertainty (fuzzy DBs). Both aspects are crucial in decision-making. Decision support systems (DSS) and executive information systems (EIS) are being integrated in wider data warehousing/data mining environments in which DB technology plays a decisive role.
3 Conceptual Schema of the Behavior Most IS domains change through time, at two levels: conceptual schema and state. Changes at the conceptual schema level are less frequent than those at the state level, and their origin is due to changes in users interests: For whatever reason, users lose interest in the representation of some entities and relationships or they want other entities and relationships to be represented in the IS. The most frequent changes (and the only ones we consider here) occur at the state level.
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