Classification of logical data models implemented by contemporary DBMS

Apart from relational model, many contemporary DBMS implement different data models, including extensions of relational ones. Most of DBMS implement also multiple data models, and are so called “multi-model”. However, there is no commonly used classification of actual data models that is a disorientating factor for database users: engineers, students, teachers, analysts, etc. This article contains common terms and definitions as well as the history of earlier model classification proposed by other experts in the database domain since the 1970s. Developing the graph-based and set-based classification approach, and classical hierarchy-network-relational triad, the article proposes an improved two-axis data model classification including new semi-structured ones as well as examples of DBMS implementing these models.

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