InterBase (KB): A Knowledge-based Multidatabase System for Data Warehousing

This paper describes the extension of a mullidatnbase system with a knowledge-base module in order to support data warehousing. The multidatabase system integrates various component databases with a common query and transaction specification language, however, il does not provide capabilily for schema integration. The knowledge base module provides a declarative logic language with second-order syntax but first-order semantics for integrating the schemes of the data sources into the warehouse and for defining complex materialized views. Funhennore, the views are self-maintainable, i.e. they are incrementally maintained by an efficient mechanism that uses only the changes to the data source