Read e-book online Advances in Databases and Information Systems: 5th East PDF

By Franca Garzotto (auth.), Albertas Caplinskas, Johann Eder (eds.)

ISBN-10: 3540425551

ISBN-13: 9783540425557

This e-book constitutes the refereed lawsuits of the fifth East ecu convention on Advances in Databases and knowledge structures, ADBIS 2001, held in Vilnius, Lithuania, in September 2001.
The 25 revised complete papers provided including one invited paper and abstracts of invited talks have been rigorously reviewed and chosen from eighty two submissions. The papers are geared up in topical sections on question optimization, multimedia and multilingual info structures, spatiotemporal points of databases, facts mining, transaction processing, conceptual modeling and knowledge structures specification, lively databases, question tools, XML, and data platforms design.

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Extra info for Advances in Databases and Information Systems: 5th East European Conference, ADBIS 2001 Vilnius, Lithuania, September 25–28, 2001 Proceedings

Example text

Such parts are called dead subqueries (parts), because they do not contribute to the final result. ) Query modification has been adopted and generalized for object-oriented query languages such as OQL [12]. This technique prepares a foundation for our method of detecting and removing dead subqueries. Such optimization is performed through rewriting a query into a semantically equivalent query having no dead subqueries. g. based on factoring out independent subqueries, changing the order of operators, indices [4,5,6].

Hence the straightforward approach to view processing may result in a significant waste of processing time. The problem has been partly solved for relational query languages through the technique known as query modification [8]: a view definition is treated as a macro-definition, where each view invocation is textually substituted with the query from the body of the view definition. Then, the parts of the view definition not used in a particular query are removed from the resulting query. Such parts are called dead subqueries (parts), because they do not contribute to the final result.

On the other hand this process description can be used to derive recommendations for future production processes in the sense of instructions that have to be carried out for tasks similar to a successfully completed process [14]. Well-documented production processes can serve as templates for future production and contribute to process standardization [25]. XML-based languages such as XRL (eXchangeable Routing Language [31]) can be used to represent such processes. In summary, we expect a twofold contribution when using XML as a common SOWing interface: XML-based tools will substantially and rapidly enhance the SOWing functionality and, in reverse, the SOWing model will give a semantic underpinning and connectivity to XML services and thus significantly improve their usability.

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Advances in Databases and Information Systems: 5th East European Conference, ADBIS 2001 Vilnius, Lithuania, September 25–28, 2001 Proceedings by Franca Garzotto (auth.), Albertas Caplinskas, Johann Eder (eds.)


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