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Situation Monitoring for Active Databases.

Arnon Rosenthal, Sharma Chakravarthy, Barbara T. Blaustein, José A. Blakeley: Situation Monitoring for Active Databases. VLDB 1989: 455-464
@inproceedings{DBLP:conf/vldb/RosenthalCBB89,
  author    = {Arnon Rosenthal and
               Sharma Chakravarthy and
               Barbara T. Blaustein and
               Jos{\'e} A. Blakeley},
  editor    = {Peter M. G. Apers and
               Gio Wiederhold},
  title     = {Situation Monitoring for Active Databases},
  booktitle = {Proceedings of the Fifteenth International Conference on Very
               Large Data Bases, August 22-25, 1989, Amsterdam, The Netherlands},
  publisher = {Morgan Kaufmann},
  year      = {1989},
  isbn      = {1-55860-101-5},
  pages     = {455-464},
  ee        = {http://www.vldb.org/conf/1989/P455.PDF},
  crossref  = {DBLP:conf/vldb/89},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

We present a basis for efficiently evaluating the situation (event and condition) portion of situation/action rules. either in an active database or in a standalone situation monitor. A common framework handles situations involving both database changes and nondatabase situations. We introduce DELTARelations to represent net changes to a stored or derived relation. We define an operator that computes DeltaRelations for derived relations. Evaluation of expressions involving changes is optimized by defining incremental forms of relational operators and by providing a chain rule that extends incremental computation to data derived by arbitrary expressions.

Copyright © 1989 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

Peter M. G. Apers, Gio Wiederhold (Eds.): Proceedings of the Fifteenth International Conference on Very Large Data Bases, August 22-25, 1989, Amsterdam, The Netherlands. Morgan Kaufmann 1989, ISBN 1-55860-101-5
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