Download PDF by Gio Wiederhold (auth.), Brian Lings, Keith Jeffery (eds.): Advances in Databases: 17th British National Conference on

By Gio Wiederhold (auth.), Brian Lings, Keith Jeffery (eds.)

After a decade of significant technical and theoretical developments within the region, the scope for exploitation of database expertise hasn't ever been higher. Neither has the problem. This quantity includes the court cases of the seventeenth British nationwide convention on Databases (BNCOD 2000), held on the collage of Exeter in July 2000. In opting for the standard papers offered the following, the programme committee was once p- ticularly drawn to the calls for being made at the expertise through rising program parts, together with net purposes, push expertise, multimedia facts, and information warehousing. the worry continues to be an identical: pride of person - quirements on caliber and function. although, with expanding call for for well timed entry to heterogeneous info disbursed on an unregulated web, new demanding situations are awarded. Our 3 invited audio system enhance the subject matter for the convention, contemplating new dimensions referring to consumer standards in getting access to allotted, hete- geneous details resources. within the ?rst paper offered the following, Gio Wiederhold re?ects at the stress among requisites for, at the one hand, precision and relevance and at the different completeness and remember in pertaining to information from heterogeneous assets. In resolving this rigidity in favour of the previous, he keeps that this can essentially a?ect destiny learn instructions. Sharma Chakravarthy provides one other size to the requirement on inf- mation, particularly timeliness. He stocks a imaginative and prescient of just-in-time details de- vered through a push know-how according to reactive features. He keeps that this calls for a paradigm shift to a user-centric view of information.

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Thus, the optimizer can easily detect, when a new statement requests an intermediate result that has already been calculated earlier. 4 Experiments To analyze the bene ts of multi-query optimization in a data mining scenario, we run experiments using the DD Benchmark BRK98]. The DD Benchmark creates a typical Data Mining workload. It consists of 5 batches of queries, 133 queries altogether. All queries perform selections, groupings, and aggregations on a subset of the attributes of a single relational table.

An important result that goes beyond this requirement, however, is that the performance improvement over the Grid File is greater the higher the dimension. 1 Introduction Underlying any dbms is some form of repository management system or data store. The classic and dominant model for such repositories is that of some form of logical record or data aggregate type with a collection of instances conforming to that type usually termed a file. Such file systems are, of course, also used directly in many applications.

Freeston. The BANG File: A New Kind of Grid File. In: Umeshwar Dayal and Irving L. Traiger (eds): Proceedings of the Association for Computing Machinery Special Interest Group on Management of Data Annual Conference, May 27-29, 1987, San Francisco, California, pages 260-269. ACM Press. 7. Volker Gaede and Oliver G¨ unther. Multidimensional Access Methods. ACM Computing Surveys, 30(2):170–231, June 1998. 8. Antonin Guttman. R-Trees: A Dynamic Index Structure for Spatial Seaching. In: SIGMOD ‘84: Proceedings of the Annual Meeting, volume 14(2) of SIGMOD Record, pages 47–57.

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