Get Advanced data warehouse design : from conventional to PDF

By Elzbieta Malinowski

ISBN-10: 3540744045

ISBN-13: 9783540744047

ISBN-10: 3540744053

ISBN-13: 9783540744054

This unparalleled paintings offers readers with an creation to the state of the art learn on info warehouse layout, with many references to extra precise resources. It deals a transparent and a concise presentation of the foremost recommendations and leads to the topic region. Malinowski and Zimányi clarify traditional facts warehouse layout intimately, and also tackle cutting edge domain names lately brought to increase the functions of information warehouse structures: specifically, the administration of spatial and temporal information.

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Example text

In order to define the third normal form, we must define one additional concept: • A dependency X → Z is transitive if there is a set of attributes Y such that the dependencies X → Y and Y → Z hold. Now we can give the definition of the third normal form: A relation is in the third normal form if it is in the second normal form and there are no transitive dependencies between a key and a nonprime attribute. The table Assistant above is not in the third normal form, since there is a transitive dependency from Employee no to Advisor id, and from Advisor id to Advisor first name, Advisor last name, and Advisor email.

5 is an additive measure: it can be summarized when the hierarchies in the Store, Time, and Product dimensions are traversed. • Semiadditive measures (also called stock or level measures) can be meaningfully summarized using addition along some, but not all, dimensions. A typical example is that of inventory quantities. These can be aggregated in the Store dimension in Fig. 6 The Multidimensional Model 47 or a city, but cannot be aggregated in the Time dimension, for instance by adding the inventory quantities for two different quarters.

When a multiplecolumn index is created, the order of columns in the index has an impact on data retrieval. Generally, the most restrictive value should be placed first for optimum performance. Another categorization of indexes is according to whether they are unique or nonunique: unique indexes do not allow duplicate values, while this is not the case for nonunique indexes. In addition, an index can be sparse or dense: a sparse index has index records for only some of the search values in the file, while a dense index has an index record for every search value in the file.

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Advanced data warehouse design : from conventional to spatial and temporal applications by Elzbieta Malinowski

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