Model 204
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Model 204 is a DBMS for IBM and compatible mainframes, running under OS/390. 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 uses bit-map indexing. It automatically combines the use of bit-mapping, hashing, B-tree, and record list technologies to optimize speed and efficiency of database access.
Professor Patrick E. O'Neil wrote the B+ tree for Model 204. A B+ tree is a variation on a B-tree.
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] External links
- Computer Corporation of America
- Sirius Software
- An example of Model 204 User Language programming
- Model 204 - A Novel DBMS and Application Platform
- Curriculm Vitae of Patrick O'Neil, Professor, Dept. of Computer Science, University of Massachusetts at Boston, USA
- Database Programmer's Toolkit - The Model 204 emulator for Windows
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