Database Pointers in Navigational and Object–Oriented Database Management Systems

TL;DRAbstract

As information systems and, more specifically, database management systems, attempt to model particular application environments, they must be able to account for and keep track of how the entities in the environments relate to each other. In the first or navigational generation of DBMS, relationships were maintained by pointer chains that connected the records representing the related entities. In the second or relational generation of DBMS, the tuples, representing related entities were not connected by pointers, but could be “joined†at query time based on common values of particular fields. In the third or object–oriented generation of DBMS, there are two major structural approaches. One is a pointer–based approach while the other, is designed to add advanced, object–oriented features to the relational model. Recently, perhaps inevitably, interest in the object–oriented pointer–based approach has led to questions of whether it is, in some sense, a return to navigationa

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