By Robert Wrembel
Facts warehouses and on-line analytical processing (OLAP) are rising key applied sciences for firm choice aid platforms. they supply subtle applied sciences from information integration, information assortment and retrieval, question optimization, and information research to complicated person interfaces. New study and technological achievements within the sector of knowledge warehousing are applied in advertisement database administration structures, and agencies are constructing facts warehouse structures into their details process infrastructures. facts Warehouses and OLAP: suggestions, Architectures and options covers a variety of technical, technological, and examine matters. It offers theoretical frameworks, provides demanding situations and their attainable ideas, and examines the newest empirical study findings within the zone. it's a source of attainable recommendations and applied sciences that may be utilized while designing, imposing, and deploying an information warehouse, and assists within the dissemination of information during this box.
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Additional resources for Data Warehouses and Olap: Concepts, Architectures and Solutions by Robert Wrembel (2006-12-11)
Example text
A Figure 3. is prohibited. Conceptual Modeling Solutions for the Data Warehouse fact is graphically represented by a box with two sections, one for the fact name and one for the measures. It is essential for a fact to have some dynamic aspects, that is, to evolve somehow across time. 1: The concepts represented in the data source by frequentlyupdated archives are good candidates for facts; those represented by almost-static archives are not. Thus, the choice of facts should be based either on the average periodicity of changes, or on the specific interests of analysis.
Is prohibited. Conceptual Modeling Solutions for the Data Warehouse 2 2. Create, in the Tropos formalism, a decisional model that expresses the analysis goals of decision makers and their information needs. 3. Map facts, dimensions, and measures identified during requirement analysis onto entities in the source schema. 4. Generate a preliminary conceptual schema by navigating the functional dependencies expressed by the source schema. 5. Edit the fact schemata to fully meet the user expectations.
Handling Structural Heterogeneity in OLAP 2 Figure 1. A homogeneous product dimension; (a) hierarchy schema; (b) hierarchy domain All all d1 Department Category Brand c1 c2 b1 b2 Product (A) p1 p2 p3 p4 (B) Note: To each category node in (a) correspond a set of element nodes in (b). This dimension is homogeneous; that is, each element node has the same structure; their ancestors induce the same subgraph. In this sense the dimension can be regarded as structurally homogeneous. In several situations, the structure of the elements in a category may not be the same.