Model 204
From Wikipedia, the free encyclopedia
Model 204 is a DBMS for IBM and compatible mainframes, which was first deployed in 1972. It is more than just a database system, incorporating a programming language and an environment for application development. Its key strength is its ability to deal with very large databases (VLDB) and very high transaction loads.
Model 204 relies on its own type of bitmap index, originally devised by Professor Patrick E. O'Neil, and also combines the use of hash table, B-tree, and record list technologies to optimize speed and efficiency of database access.[1]
Model 204 is most commonly used in government and military applications. Among other things, it runs Australia's social security system (Centrelink). It is used commercially in the UK by Marks & Spencer.
It is a product of Computer Corporation of America (CCA).
Add-on products are available from Sirius Software.
Database Programmer's Toolkit is a freeware PC-based emulation.
[edit] Notes and references
- ^ Sandy Stanhope, Database Administrator. What is Model 204?. The Youngstown State University Computing Newsletter. Department of Computer Services. Retrieved on 11 January 2008.
[edit] See also
[edit] External links
- Computer Corporation of America
- An example of Model 204 User Language programming
- Model 204 - A Novel DBMS and Application Platform
- Curriculum Vitae of Patrick O'Neil, Professor, Dept. of Computer Science, University of Massachusetts at Boston, USA
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