Model 204

Model 204 is a database system for IBM and compatible mainframes, running under OS/390. It is more than just a database system, incorporating also a programming language and environment for application development. Its key strength is its ability to deal with massive databases and transaction loads.

It is most commonly used in government and military applications. Among other things, it runs Australia's social security system (Centrelink).

It is a product of Computer Corporation of America.