Versions and change notification in an object-oriented database system

Abstract

The authors have built a prototype object-oriented database system called ORION to support applications from the CAD/CAM (computer-aided-design/computer-aided-manufacturing), AI (artificial-intelligence), and office-information-system domains. Advanced functions supported in ORION include versions, change notification, composite objects, dynamic schema evolution, and multimedia data. The versions and change notification features are based on a model that the authors developed earlier. They have integrated their model of versions and change notification into the ORION object-oriented data model, and also provide an insight into system overhead that versions and change notification incur.<>