Model 204 is a DBMS for IBM and compatible mainframes, which was first deployed in 1972. A database management system ( DBMS) is Computer software designed for the purpose of managing Databases DBMSes may use any of a variety of Data models IBM mainframes, though perceived as synonymous with Mainframe computers in general due to their marketshare are now technically and specifically IBM 's line of business Year 1972 ( MCMLXXII) was a Leap year starting on Saturday (link will display full calendar of the Gregorian calendar. 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. A very large database, or VLDB, is a database that contains an extremely high number of Tuples (database rows or occupies an extremely large physical Filesystem
Model 204 relies on its own type of bitmap index, originally devised by Professor Patrick E. A bitmap index is a special kind of database index. Bitmap indexes have traditionally been considered to work well for data such as gender which has a small number of distinct O'Neil, and also combines the use of hash table, B-tree, and record list technologies to optimize speed and efficiency of database access. In Computer science, a hash table, or a hash map, is a Data structure that associates keys with values. In Computer science, a B-tree is a Tree data structure that keeps data sorted and allows searches insertions and deletions in logarithmic amortized [1]
Model 204 is most commonly used in government and military applications. Among other things, it runs Australia's social security system (Centrelink). Centrelink is the trading name of the Commonwealth Service Delivery Agency (CSDA a statutory authority responsible for delivering human services on behalf of agencies of the It is used commercially in the UK by Marks & Spencer. Marks & Spencer Group plc (also M&S, Marks and Sparks, and Marks) is a British Retailer with 843 stores in more than 30
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. Database Programmer's Toolkit (DPT is a freeware product which emulates CCA 's Model 204 DBMS.
Notes and references
- ^ Sandy Stanhope, Database Administrator. What is Model 204?. The Youngstown State University Computing Newsletter. Youngstown State University, founded in 1908 is an accredited University located in Youngstown, Ohio, United States. Department of Computer Services. Retrieved on 11 January 2008.
See also
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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