Proceedings of 16th International Conference on Distributed Computing Systems (1996)
May 27, 1996 to May 30, 1996
A. Tomasic , Inst. Nat. de Recherche en Inf. et Autom., Le Chesnay, France
L. Raschid , Inst. Nat. de Recherche en Inf. et Autom., Le Chesnay, France
P. Valduriez , Inst. Nat. de Recherche en Inf. et Autom., Le Chesnay, France
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 implementers must deal with the translation of queries between query languages and schemas. The Distributed Information Search COmponent (Disco) 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 of Disco, (b) its query processing semantics, (C) the data model and its modeling of data source connections, and (d) the interface to underlying data sources.
distributed databases; query processing; query languages; data structures; heterogeneous databases; Disco; data sources; distributed databases; application programmers; end users; query languages; schemas; distributed information search component; data modeling techniques; distributed mediator architecture; query processing semantics; data model
L. Raschid, P. Valduriez and A. Tomasic, "Scaling heterogeneous databases and the design of Disco," Proceedings of 16th International Conference on Distributed Computing Systems(ICDCS), Hong Kong, 1996, pp. 449.