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Key Concepts of the PRIMA Access System
Andrea Sikeler
University Kaiserslautern
Abstract
PRIMA, as the kernel of a non-standard database management system (NDBMS), is divided into multiple layers representing different levels of abstraction. The access system is an internal layer implementing an atom-oriented interface which allows for direct and navigational retrieval as well as manipulation of single atoms. Different kinds of scan operations support sequential access to either homogeneous or heterogeneous atom sets. Some scan operations, however, depend on certain storage structures (namely access path structures, sort orders, and atom clusters) which introduce redundancy to be maintained by the access system.
This paper describes the current state of the access system and its embedding into the overall PRIMA system (especially transaction concept). It gives an overview of our design decisions and of some implementation aspects.
in: SFB-Bericht 26/88, SFB 124, University of Kaiserslautern, 1988
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