By Elzbieta Malinowski
This remarkable paintings offers readers with an creation to the cutting-edge learn on information warehouse layout, with many references to extra precise resources. It deals a transparent and a concise presentation of the main innovations and leads to the topic sector. Malinowski and Zim?nyi clarify traditional information warehouse layout intimately, and also tackle leading edge domain names lately brought to increase the services of knowledge warehouse platforms: particularly, the administration of spatial and temporal details.
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Additional resources for Advanced Data Warehouse Design: From Conventional to Spatial and Temporal Applications (Data-Centric Systems and Applications)
12 concludes this chapter. 1 Database Concepts Databases constitute the core component of today’s information systems. A database is a shared collection of logically related data, and a description of that data, designed to meet the information needs and support the activities of an organization. A database is deployed on a database management system(DBMS), which is a software system that allows users to deﬁne, create, manipulate, and administer a database. Designing a database system is a complex undertaking that is typically divided into four phases: • • Requirements speciﬁcation, which collects information about the users’ needs with respect to the database system.
It is not clear in which situations it is better to use either one of these approaches. As a consequence, many data warehouse projects do not give much importance to the requirements speciﬁcation phase, and focus instead on more technical aspects . This may lead to a situation where the data warehouse may not meet users’ expectations for supporting the decision-making process. In addition, some of the existing proposals include additional phases corresponding to particular characteristics of the conceptual multidimensional model in use.
1. Recall that in this case it is supposed that there is a functional dependency Location → Project id. A relation is in the Boyce-Codd normal form with respect to a set of functional dependencies F if, for every nontrivial dependency X → Y that can be derived from F , X is a key or contains a key of R. The table Participates above is not in the Boyce-Codd normal form, since the above functional dependency holds and Location is not a key of the relation. To make the relation comply with the Boyce-Codd form, the attribute Location must be removed from the table, and an additional table LocationProject(Location, Project id) must be added to store the information about the project associated with each location.
Advanced Data Warehouse Design: From Conventional to Spatial and Temporal Applications (Data-Centric Systems and Applications) by Elzbieta Malinowski