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Many-Dimensional Schema Modeling - ftp12.us.freebsd.org

Many-Dimensional Schema Modeling - ftp12.us.freebsd.org

Many-Dimensional Schema Modeling -

Many-Dimensional Schema ModelingThomas Feyer and Bernhard ThalheimComputer Science InstituteBrandenburg University of Technology at CottbusPostBox 101344, D-03013 Cottbus{feyer,thalheim}@informatik.tu-cottbus.deAbstract. Large database schemata can be drastically simplified if techniquesof modular and structural modeling are used. Applications andthus schemata have an inner meta-structure. The explicit treatment ofthe inner structuring may be used during development of large databaseschemata and may ease the development to a large extent. It is surprisingthat dimensions and internal separations have not been consideredyet also they are very natural and easy to capture. This paper developsan approach to explicit treatment of the inherent many-dimensionalstructuring on the basis of dimensions such as the kernel dimension, theassociation dimension, the log dimension, the meta-characterization dimension,and the lifespan dimension.1 IntroductionIt is a common observation that large database schemata are error-prone, difficultto maintain and to extend and not-surveyable. Moreover, development ofretrieval and operation facilities requires highest professional skills in abstraction,memorization and programming. Such schemata reach sizes of more than1000 attribute, entity and relationship types. Since they are not comprehensibleany change to the schema is performed by extending the schema and thus makingit even more complex 1 . Database designers and programmers are not ableto capture the schema. Systems such as SAP R/3 use more than 21.000 baserelations and 40.000 view relations with an overall number of different attributenames far beyond 35.000. They are highly repetitive and redundant. For thisreason, performance decreases due to bad schema design.1 The initial idea behind the R/3 system has been the modularity and separationwithin the application areas. There are sub-components, e.g., handling production,budgeting, billing, human resources. The modularization has, however, not beenimplemented and pushed. Thus, the schema was becoming super-redundant. Theredundancy was raising with each new part in the system.Y. Manolopoulos and P. Návrat (Eds.): ADBIS 2002, LNCS 2435, pp. 305–318, 2002.c○ Springer-Verlag Berlin Heidelberg 2002

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