Squirrel Phase 1: Generating Data Integration Mediators that Use Materialization
COLORADO UNIV AT BOULDER DEPT OF COMPUTER SCIENCE
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This paper presents a framework for data integration that is based on using squirrel integration mediators that use materialization to support integrated views over multiple databases. These mediators generalize techniques from active databases to provide incremental propagation of updates to the materialized views. A framework based on View Decomposition Plans for optimizing the support of materialized integrated views is introduced. The paper describes the Squirrel prototype currently under development, which can generate Squirrel mediators based on high-level specifications. The integration of information by Squirrel-generated mediators is expressed primarily through an extended version of a standard query language, that can refer to data from multiple information sources. The Squirrel framework also provides efficient support for the problem of object matching, that is, determining when object representations e.g., OIDs in different databases correspond to the same object-in-the-world, even if a universal key is not available. To establish a context for the research, the presents a taxonomy that surveys a broad variety of approaches to supporting and maintaining integrated views.
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