ACM SIGMOD Anthology VLDB dblp.uni-trier.de

An External Schema Facility for CODASYL 1978.

Eric K. Clemons: An External Schema Facility for CODASYL 1978. VLDB 1979: 119-128
@inproceedings{DBLP:conf/vldb/Clemons79,
  author    = {Eric K. Clemons},
  editor    = {Antonio L. Furtado and
               Howard L. Morgan},
  title     = {An External Schema Facility for CODASYL 1978},
  booktitle = {Fifth International Conference on Very Large Data Bases, October
               3-5, 1979, Rio de Janeiro, Brazil, Proceedings},
  publisher = {IEEE Computer Society},
  year      = {1979},
  pages     = {119-128},
  ee        = {db/conf/vldb/Clemons79.html},
  crossref  = {DBLP:conf/vldb/79},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

Abstract

We propose as an extension to the CODASYL Data Description Language a new external schema facility more powerful than that presently offered by CODASYL subschemas. We note that the present facility relies on records and sets that closely resemble those employed in the schema, with unfortunate implications for programmer productivity, data independence, and communications channel traffic. We propose instead a powerful external schema facility that, in effect, offers applications programmers a virtual data base. This data base, while derivable from the stored data base, is not constrained to resemble it in form; thus programmers will use records formatted, not like those stored in the common data base, but like the cognitive structures employed in program development. A possible language for external schema definition is introduced.

Copyright © 1979 by The Institute of Electrical and Electronic Engineers, Inc. (IEEE). Abstract used with permission.


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Antonio L. Furtado, Howard L. Morgan (Eds.): Fifth International Conference on Very Large Data Bases, October 3-5, 1979, Rio de Janeiro, Brazil, Proceedings. IEEE Computer Society 1979
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