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Erschienen in:
2006 | OriginalPaper | Buchkapitel
Optimising Abstract Object-Oriented Database Schemas
verfasst von : Joachim Biskup, Ralf Menzel
Erschienen in: Conceptual Modeling - ER 2006
Verlag: Springer Berlin Heidelberg
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Conceptual design is one step on the way from requirements analysis to implementation. During conceptual design of a database application we work with conceptual database schemas, which are based on a formal model. Because of this formal model it is possible to investigate equivalence of schemas and consequently to examine schema transformations. In an earlier work we presented a cost model that allows us to estimate time costs for machine programs of an abstract database machine. In this paper we show how this cost model can be employed to evaluate cost effects of schema transformations. This enables us to steer schema transformations to meet given time requirements of critical database queries and updates. In particular, we analyse the schema transformation pivoting. As a result of such an analysis we can characterise high-level queries and updates and tell how the time required for their execution is affected by the schema transformation.