Specifications in a Data Independent Accessing Model

  • Authors:
  • E. B. Altman;M. M. Astrahan;P. L. Fehder;M. E. Senko

  • Affiliations:
  • -;-;-;-

  • Venue:
  • SIGFIDET '72 Proceedings of 1972 ACM-SIGFIDET workshop on Data description, access and control
  • Year:
  • 1972

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Abstract

The Data Independent Accessing Model (DIAM) Project of the Information Sciences Department of IBM Research is directed towards developing an architectural basis for an advanced data base system - a data base system which, in addition to providing advanced functional capabilities and a new level of data independence, is not limited either in the access paths which can be declared (in order to support the user-specified information collections) or in the encodings which are possible for those access paths. We have already been presented with a general overview of the basic system (1). In that overview, DIAM was seen to be composed of 4 basic levels of description: the Entity Set Model the String Structure Model the Encoding Model the Physical Device Model. In this paper we shall concentrate on the middle two of these levels - the String Structure and the Encoding Models.