Elimination of View and Redundant Variables in a SQL-like Database Language for Extended NF2 Structures.

@inproceedings{DBLP:conf/vldb/SudkampL90,
  author    = {Norbert S{\"u}dkamp and
               Volker Linnemann},
  editor    = {Dennis McLeod and
               Ron Sacks-Davis and
               Hans-J{\"o}rg Schek},
  title     = {Elimination of View and Redundant Variables in a SQL-like Database
               Language for Extended NF2 Structures},
  booktitle = {16th International Conference on Very Large Data Bases, August
               13-16, 1990, Brisbane, Queensland, Australia, Proceedings},
  publisher = {Morgan Kaufmann},
  year      = {1990},
  isbn      = {1-55860-149-X},
  pages     = {302-313},
  ee        = {db/conf/vldb/SudkampL90.html},
  crossref  = {DBLP:conf/vldb/90},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

The Advanced Information Management Prototype (AIM) is an experimental database system, developed and prototyped at the IBM Scientific Center in Heidelberg,Germany. The underlying data model is an extension of the NF² data model. It is founded on the notions of tuple, set and list. These three constructors may be applied to any valid structure in any order, starting with some atomic domain(s), to get a valid AIM database structure. The corresponding database language, called HDBL (Heidelberg Data Base Language) is an SQL-type language meeting the requirements of the extended NF² data model.

In this paper we investigate the problem of improving the evaluation of HDBL queries by transformation of the query. The first kind of transformation deals with view processing. Given an HDBL query containing a view it is often not necessary to materializethe view. We will give some rules on how to eliminate the view and evaluate the query against the base relations. Another kind of transformation will be used to remove variables from the query. Some of these transformations are equivalent to the removal of redundant join operations in the relational algebra; a second way to remove variables is the introduction of "complex projections" which can directly be mapped to operations at the storage access interface of the DBMS.

Copyright © 1990 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.

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Referenced by

1. Elisa Bertino, Mauro Negri, Giuseppe Pelagatti, Licia Sbattella: Object-Oriented Query Languages: The Notion and the Issues. IEEE Trans. Knowl. Data Eng. 4(3): 223-237(1992)