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This report presents a review of the problems that were discussed during the Workshop on Semantic Heterogeneity and Interoperability in Multidatabase Systems. The workshop participants discussed the importance of interoperation in the U S WEST information processing environment and the progress that has been achieved in three major research areas:(More)
The integration of heterogeneous database environments is a difficult and complex task. The A la carte Framework addresses this complexity by providing a reusable and extensible architecture in which a set of heterogeneous database management systems can be integrated. The goal is to support incremental integration of existing database facilities into(More)
The size of The Boeing Company posts some stringent requirements on data warehouse design and implementation. We summarize four interesting and challenging issues in developing very large scale data warehouses, namely failure recovery, incremental update maintenance, cost model for schema design and query optimization, and metadata definition and(More)
Today, enterprises maintain many, disparate information sources over which complex business procedures and applications are executed. The informal and ad hoc characteristics of these environments make the information in them very prone to inconsistency. Yet, the exibility of application execution given to diierent parts of an organization is desirable. This(More)
The concept of transactions and its application has found wide and often indiscriminate usage. In large enterprises, the model for distributed database applications has moved away from the client-server model to a multi-tier model with large database application software forming the middle tier. The software philosophy of “buy and not build” in(More)