Version Management in Federated Database Systems (Dissertations in Database and Information Systems, 81)

This work provides the conceptual foundations for the extension of federated database technology with the management of versioned data. It determines the requirements of a "versioned" federation compared to an "unversioned" one, and then develops features to fulfil these requirements. These features include a version model for the federation that allows to integrate versions from the component systems' heterogenous version models, and a mechanism for the propagation of versioning-relevant operations from the component systems to the federation and vice versa. A prototypical implementation for a simplified environment is described to show the feasibility of the proposed solutions.