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The general structure of a relational database. Codd, of IBM’s San Jose Research Laboratory. Most databases in widespread use are based on the relational database model.
RDBMSs have been a common choice for the storage of information in new databases used for financial records, manufacturing and logistical information, personnel data, and other applications since the 1980s. Relational databases have often replaced legacy hierarchical databases and network databases because they are easier to understand and use. XML database management systems in the 1990s. Despite such attempts, RDBMSs keep most of the market share, which has also grown over the years.
In 1974, IBM began developing System R, a research project to develop a prototype RDBMS. However, the first commercially available RDBMS was Oracle, released in 1979 by Relational Software, now Oracle Corporation.