OQL: a query language for manipulating object-oriented databases
VLDB '89 Proceedings of the 15th international conference on Very large data bases
Federated database systems for managing distributed, heterogeneous, and autonomous databases
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
Object orientation in multidatabase systems
ACM Computing Surveys (CSUR)
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Transparent access to widespread enterprise information using uniform interfaces (e.g. WWW- based ones) is one of the main features of the Virtual Enterprise concept. This concept is based on a set of geographically distributed enterprise sites connected to a MDBS (Multi Data Base System), by an intranet facility, to obtain information integration, knowledge sharing and users collaboration. The MDBS is a system that provides access to data from a collection of DBSs (Data Base Systems), called component DBSs, that are heterogeneous and distributed. The integration of the component DBSs into the MDBS is performed by a complex of functions termed gateway. This paper describes the design of a gateway based on the distributed object computing (DOC) approach, and compliant to the CORBA (Common Object Request Broker Architecture) standard. The approach is shown to introduce savings in design complexity and cost. The details of the approach are described in a gateway case study for the integration of a relational DBS into a MDBS.