Scaling Heterogeneous Databases and the Design of Disco

Access to large numbers of data sources introduces new problems for users of heterogeneous distributed databases. End users and application programmers must deal with unavailable data sources. Database administrators must deal with incorporating new sources into the model. Database implementors must deal with the translation of queries between query languages and schemas. The Distributed Information Search COmponent (Disco) 1 addresses these problems. Query processing semantics are developed to process queries over data sources which do not return answers. Data modeling techniques manage connections to data sources. The component interface to data sources flexibly handles different query languages and translates queries. This paper describes (a) the distributed mediator architecture ofDisco, (b) its query processing semantics, (c) the data model and its modeling of data source connections, and (d) the interface to underlying data sources. 1

Information brokering on the World Wide Web

Cover title.Includes bibliographical references (p. 6).Stefane Bressan & Thomas Lee

Semantic integration of disparate information soruces over the Internet using constraint propagation

Cover title.Includes bibliographical references (p. 9-10).Stephane Bressan & Cheng Goh

Multimodal integration of disparate information sources with attribution

Cover title.Includes bibliographical references (p. [9]-[10]).Thomas Y. Lee & Stephane Bressan

Context knowledge representation and reasoning in the context interchange system

"October, 1999."Includes bibliographical references (p. 13-14).Stephane Bressan ... [et al.