By Gio Wiederhold (auth.), Brian Lings, Keith Jeffery (eds.)
After a decade of significant technical and theoretical developments within the zone, the scope for exploitation of database expertise hasn't ever been larger. Neither has the problem. This quantity includes the complaints of the seventeenth British nationwide convention on Databases (BNCOD 2000), held on the college of Exeter in July 2000. In identifying the standard papers provided right here, the programme committee was once p- ticularly drawn to the calls for being made at the know-how via rising program parts, together with internet functions, push expertise, multimedia information, and knowledge warehousing. the worry continues to be an analogous: pride of consumer - quirements on caliber and function. even if, with expanding call for for well timed entry to heterogeneous info disbursed on an unregulated net, new demanding situations are provided. Our 3 invited audio system strengthen the topic for the convention, contemplating new dimensions bearing on person necessities in having access to disbursed, hete- geneous info resources. within the ?rst paper provided the following, Gio Wiederhold re?ects at the rigidity among standards for, at the one hand, precision and relevance and at the different completeness and keep in mind in touching on information from heterogeneous assets. In resolving this pressure in favour of the previous, he continues that this may essentially a?ect destiny study 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 by way of a push know-how in keeping with reactive services. He continues that this calls for a paradigm shift to a user-centric view of information.
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Further details of performance tests undertaken can be found in Lawder’s thesis . We have also modiﬁed our software to give versions which use other space-ﬁlling curves and made some comparisons with the Hilbert Curve software. Our provisional conclusion is that none is better than the Hilbert Curve but more work is needed on this aspect. K. H. King Considerable scope remains for carrying out further experimentation and a number of potentially signiﬁcant improvements need investigating. One interesting possibility is not to regard the pages as covering the whole curve.
11. Akhil Kumar. A Study of Spatial Clustering Techniques. In: Dimitris Karagiannis (ed): Proceedings of the 5th International Conference on Database and Expert Systems Applications (DEXA ‘94), volume 856 of Lecture Notes in Computer Science, pages 57–71. Springer-Verlag, Sept 1994. Using Space-Filling Curves for Multi-dimensional Indexing 35 12. Jonathan Lawder. The Application of Space-Filling Curves to the Storage and Retrieval of Multi-dimensional Data (Submitted for PhD). Technical Report JL/1/99, Birkbeck College, University of London, 1999.
Parallel blocks Sample Dependency Graph (\f g") are are executed one after another. All operations or tasks within a parallel block (\fj jg") are executed concurrently. ::: ::: Re-use of Cached Intermediate Results The execution engine keeps all intermediate results materialized in main memory. 1 By annotating the nodes in the dependency graph appropriately, the optimizer keeps track of which intermediate results are already available and which statements still need to be executed. Thus, the optimizer can easily detect, when a new statement requests an intermediate result that has already been calculated earlier.
Advances in Databases: 17th British National Conference on Databases, BNCOD 17 Exeter, UK, July 3–5, 2000 Proceedings by Gio Wiederhold (auth.), Brian Lings, Keith Jeffery (eds.)