| Monitoring the Evolution of Databases in Federated Relational Database Systems (2007) | |||||||||||||||
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| Federated Database Systems allow users to work with data stored in multiple databases by formulating queries over an integrated view. This kind of systems are of special interest for the emerging type of information systems. In this paper we present an active mechanism to keep consistency in Federated Database Systems. Event-Condition-Action rules are used as the knowledge model. First, we show the types of events and the features of the event generator. These type of events are related to changes on both, the extension and the intension of the component databases. The event generator uses facilities provided by the operating system as well as available active mechanisms supported by the database management systems that take part of the federation. Second, we describe the type of conditions that appear in this context and show the degree of difficulty that entails verifying some of them. Third, we explain the type of actions considered. 1 Introduction It is of special interest for man... | |||||||||||||||
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