An approach to the distributed database access protocol design

Under the circumstances of intensive proliferation of distributed data-processing systems and absence of a distributed database-access protocol (DDBAP) standard, an approach to the DDBAP design is proposed. In the approach, the remote-database-access protocol (RDAP) is extended into RDAP+, and the second layer, containing all necessary functions, is developed on the basis of RDAP+. The conceptual RDAP+ model which is based on three-agent operation is discussed. The DDBAP features require the presence of the third agent, the resource manager, the functions of which are described. The extension of connection management and transaction management services provided by RDAP+ is considered. Proposals for message formats implementing these features and primitives are given