This paper presents the structure and concepts of two main functional components of the distributed file management system DISCO: The component 'access management for logical files' is responsible for the access to the distributed data. In order to achieve parallel transaction processing a page buffer system is maintained. It is shown how this page buffer system fits into the recovery concepts of DISCO. The main tasks of the 'management of the catalog for logical files' are to provide file description and mapping. The structure of the catalog system and the mechanism to preserve consistency of redundant file descriptions are described.
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