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A framework for generating and maintaining global schemas in heterogeneous multidatabase systems

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1 Author(s)
Duwairi, R.M. ; Dept. of Comput. Sci. & Inf. Syst., Jordan Univ. of Sci. & Technol., Irbid, Jordan

The problem of creating a global schema over a set of heterogeneous databases is important due to the availability of multiple databases within organizations. The global schema should provide a unified representation of local heterogeneous schemas. In this paper, we provide a general framework that supports the integration of local schemas into a global one. The framework takes into consideration the fact that local schemas are autonomous and may evolve over time, which makes the definition of the global schema obsolete. We define a set of integration operators that integrates local schemas based on the semantic relevance of their classes, and provide a model-independent representation of virtual classes of the global schema. We also define a set of modifications that can be applied to local schemas as a consequence of their local autonomy. For every local modification, we define a propagation rule that will automatically disseminate the effects of that modification to the global schema without having to regenerate it from scratch via integration.

Published in:

Information Reuse and Integration, 2003. IRI 2003. IEEE International Conference on

Date of Conference:

27-29 Oct. 2003