By Elzbieta Malinowski
This remarkable paintings presents readers with an advent to the cutting-edge examine on information warehouse layout, with many references to extra unique assets. It bargains a transparent and a concise presentation of the foremost thoughts and ends up in the topic sector. Malinowski and Zim?nyi clarify traditional info warehouse layout intimately, and also handle leading edge domain names lately brought to increase the functions of information warehouse platforms: particularly, the administration of spatial and temporal info.
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Extra info for Advanced Data Warehouse Design: From Conventional to Spatial and Temporal Applications (Data-Centric Systems and Applications)
We classify these hierarchy types, taking into account their diﬀerences at the schema and instance levels. Since current data warehouse and OLAP systems support only a limited number of hierarchy types, our proposal has important implications for users, designers, and implementers. It will give users a better understanding of the data to be analyzed and help designers to build conceptual schemas for data warehouse applications. Additionally, the proposed classiﬁcation will provide OLAP tool implementers with the requirements needed by business users for extending the functionality of current OLAP tools.
Finally, Sect. 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.
To make the relation comply with the fourth normal form, the attribute Department id must be removed from the table, and an additional table AcademicStaﬀDepart(Employee, Department id) must be added to store the information about the departments in which a member of the academic staﬀ works. 2 The Object-Relational Model As shown in the previous section, the relational model suﬀers from several weaknesses that become evident when we deal with complex applications. , a relation), which disallows multivalued and complex attributes.
Advanced Data Warehouse Design: From Conventional to Spatial and Temporal Applications (Data-Centric Systems and Applications) by Elzbieta Malinowski