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Modelling Information Preserving Databases: Consequences of the Concept of Time.

Manfred R. Klopprogge, Peter C. Lockemann: Modelling Information Preserving Databases: Consequences of the Concept of Time. VLDB 1983: 399-416
@inproceedings{DBLP:conf/vldb/KlopproggeL83,
  author    = {Manfred R. Klopprogge and
               Peter C. Lockemann},
  editor    = {Mario Schkolnick and
               Costantino Thanos},
  title     = {Modelling Information Preserving Databases: Consequences of the
               Concept of Time},
  booktitle = {9th International Conference on Very Large Data Bases, October
               31 - November 2, 1983, Florence, Italy, Proceedings},
  publisher = {Morgan Kaufmann},
  year      = {1983},
  isbn      = {0-934613-15-X},
  pages     = {399-416},
  ee        = {http://www.vldb.org/conf/1983/P399.PDF},
  crossref  = {DBLP:conf/vldb/83},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

Many modern database appllcatlons must preserve a record of the past over and above the current state of an application environment. For these applications, the concept of time is of central importance. Databases that model these applications cannot be based on the concept of state alone but must replace it by the concept of history as a function from a temporal domain to some value set. Such databases will be referred to as information preserving databases. The paper explores the consequences of the history concept mainly from a database design point of viev. Firstly, the entity-relationship model is extended to include histories. Secondly - and this is the central topic - the paper introduces for it a framevork for inferring states of the past that have not explicitly been stored in the database. The framevork is based on the notion of uncertainty, and uses procedural means and ground rules for limiting uncertainty to a few well-defined situations. Thirdly, the paper reviews the update semantics which become slightly more complex than in traditional databases. An extensive example illustrates the various concepts developed in the paper.

Copyright © 1983 by the VLDB Endowment. Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the VLDB copyright notice and the title of the publication and its date appear, and notice is given that copying is by the permission of the Very Large Data Base Endowment. To copy otherwise, or to republish, requires a fee and/or special permission from the Endowment.


Printed Edition

Mario Schkolnick, Costantino Thanos (Eds.): 9th International Conference on Very Large Data Bases, October 31 - November 2, 1983, Florence, Italy, Proceedings. Morgan Kaufmann 1983, ISBN 0-934613-15-X
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