Users access a database server either through a "front end" running on the user's computer – which displays requested data – or through the "back end", which runs on the server and handles tasks such as data analysis and storage.
Examples of proprietary database applications include Oracle, IBM Db2, Informix, and Microsoft SQL Server.
[3] The foundations for modeling large sets of data were first introduced by Charles Bachman in 1969.
DSDs provided a means to represent the relationships between different data entities.
[4] The entity–relationship model was first proposed in its current form by Peter Chen in 1976 while he was conducting research at MIT.