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Relational database model versus Object Oriented database model. The defining characteristic of a database is (arguably) the data model that it implements. A data model is an abstract, logical definition of the objects used to model the structure of data and the operators used to model its behavior. The most popular type of DBMS - and the only type that is as widely used today are the relational database systems, based on the relational data model. Relational systems: Relational systems dominate the DBMS marketplace. Briefly (and loosely), a relational system is one in which: 1. The data is perceived by the user as tables (and nothing but tables); and 2. The operators available to the user (e.g. for retrieval) are operators that generate new tables from old. The term relation is basically just a mathematical term for a table. Examples: Oracle,