The 78 CODASYL Database Model: A Comparison with Preceding Specifications.

Mary E. S. Loomis: The 78 CODASYL Database Model: A Comparison with Preceding Specifications. SIGMOD Conference 1980: 30-44

@inproceedings{DBLP:conf/sigmod/Loomis80,
  author    = {Mary E. S. Loomis},
  editor    = {Peter P. Chen and
               R. Clay Sprowls},
  title     = {The 78 CODASYL Database Model: A Comparison with Preceding Specifications},
  booktitle = {Proceedings of the 1980 ACM SIGMOD International Conference on
               Management of Data, Santa Monica, California, May 14-16, 1980},
  publisher = {ACM Press},
  year      = {1980},
  pages     = {30-44},
  ee        = {http://doi.acm.org/10.1145/582250.582256, db/conf/sigmod/Loomis80.html},
  crossref  = {DBLP:conf/sigmod/80},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

BibTeX

Abstract

This paper compares the database model specified by the CODAYSL Data Definition Language Committee in its 1978 Journal of Development and the prior model, known familiarly as the CODASYL DBTG model, as specified in 1973 and 1971. The primary achievement of the 78 model appears to be increased potential for data independence by separation of external model and internal model considerations. The external model is described by a DDL; the internal model is described by a DSDL. Additionally, there is enhanced potential ,for data integrity via more explicit expression of data integrity constraints in the DDL. Conversion of a database from 73 model CODASYL DBMS support to 78 model support is discussed with emphasis on DSDL capabilities. The range of options in the DSDL open to the database designer for specifications of internal storage structures is surveyed. Several conclusions are drawn regarding implementation of support for the 78 model.

Copyright © 1980 by the ACM, Inc., used by permission. Permission to make digital or hard copies is granted provided that copies are not made or distributed for profit or direct commercial advantage, and that copies show this notice on the first page or initial screen of a display along with the full citation.

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BibTeX

Printed Edition

Peter P. Chen, R. Clay Sprowls (Eds.): Proceedings of the 1980 ACM SIGMOD International Conference on Management of Data, Santa Monica, California, May 14-16, 1980. ACM Press 1980 BibTeX
Contents

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References

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[6]: C. J. Date, E. F. Codd: The Relational and Network Approaches: Comparison of the Application Programming Interfaces. SIGMOD Workshop, Vol. 2 1974: 83-113 BibTeX
[7]: Frank Manola: A Review of the 1978 CODASYL Database Specifications. VLDB 1978: 232-242 BibTeX
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[13]: Dennis Tsichritzis: Comments on Advantages of the Relational View. SIGMOD Workshop, Vol. 2 1974: 77-81 BibTeX
[14]: Dennis Tsichritzis, Anthony C. Klug: The ANSI/X3/SPARC DBMS Framework Report of the Study Group on Dabatase Management Systems. Inf. Syst. 3(3): 173-191(1978) BibTeX
[15]: Robert W. Taylor, Randall L. Frank: CODASYL Data-Base Management Systems. ACM Comput. Surv. 8(1): 67-103(1976) BibTeX
[16]: Ronald Fagin, Jürg Nievergelt, Nicholas Pippenger, H. Raymond Strong: Extendible Hashing - A Fast Access Method for Dynamic Files. ACM Trans. Database Syst. 4(3): 315-344(1979) BibTeX

Referenced by

Guy M. Lohman, Joseph C. Stoltzfus, Anita N. Benson, Michael D. Martin, Alfonso F. Cardenas: Remotely-Sensed Geophysical Databases: Experience and Implications for Generalized DBMS. SIGMOD Conference 1983: 146-160

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