Abstract

Modern relational DBMS use more and more object-relational features to store complex objects with nested structures and collection-valued attributes. Thus evolving towards object-relational database management systems. This paper presents results of the project “Object-Relational Database Features and Extensions: Model and Physical Aspects of the Jena Database Group. It introduces an approach to optimize the physical representation of complex types with respect to the actual workload, mainly based on two concepts: First, different variants of physical representation of complex objects can be described and controlled by a new Physical Representation Definition Language (PRDL). Second a method based on workload capturing is suggested that allows to detect the need for physical restructuring, to evaluate alternative storage structures with respect to better performance and lower execution costs and to get well-founded improvement estimations.

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