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

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

After a decade of significant technical and theoretical developments within the sector, the scope for exploitation of database expertise hasn't ever been larger. Neither has the problem. This quantity comprises the court cases of the seventeenth British nationwide convention on Databases (BNCOD 2000), held on the college of Exeter in July 2000. In determining the standard papers awarded right here, the programme committee was once p- ticularly attracted to the calls for being made at the know-how via rising software parts, together with internet purposes, push know-how, multimedia facts, and information warehousing. the worry is still an analogous: delight of person - quirements on caliber and function. even though, with expanding call for for well timed entry to heterogeneous info dispensed on an unregulated web, new demanding situations are provided. Our 3 invited audio system improve the subject for the convention, contemplating new dimensions referring to person specifications in getting access to dispensed, hete- geneous details assets. within the ?rst paper provided the following, Gio Wiederhold re?ects at the pressure among standards for, at the one hand, precision and relevance and at the different completeness and bear in mind in pertaining to information from heterogeneous assets. In resolving this stress in favour of the previous, he continues that it will essentially a?ect destiny study instructions. Sharma Chakravarthy provides one other size to the requirement on inf- mation, specifically timeliness. He stocks a imaginative and prescient of just-in-time info de- vered via a push expertise in keeping with reactive services. He keeps that this calls for a paradigm shift to a user-centric view of information.

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5 non-optimized 8 speedup 7 6 9 batch 0 batch 1 batch 2 batch 3 batch 4 batch 0-4 batch 0 batch 1 batch 2 batch 3 batch 4 batch 0-4 8 7 speedup 9 optimized 5 4 6 5 4 3 3 2 2 1 1 1 2 3 4 5 6 7 8 9 1 number of threads Figure 5. Speedup: non-optimized 2 3 4 5 6 7 8 9 number of threads Figure 6. Speedup: optimized potential for parallelism. Doing redundant work on local data in parallel, the nonoptimized version achieves near-linear speedup for the remaining batches and for the overall performance.

46 46 S. Manegold, A. Pellenkoft, and M. Kersten Table 1. batch 0 1 2 3 4 0-4 Table 2. 9 We ran the same experiments on an SGI Origin2000 with 24 MIPS R12000 CPUs (300 MHz) and 48 GB of main memory. Table 2 shows the results using a single-threaded Monet server. The improvements are similar to those on the PC. , using parallel execution. In the non-optimized version, each query forms a sequential task. All queries within one batch are independent and can be evaluated concurrently. With increasing degree of parallelism, the improvement of the optimized version over the non-optimized version slightly decreases.

A Development of the Grid File for the Storage of Binary Relations. PhD thesis, Birkbeck College, University of London, 1989. 4. Christos Faloutsos and Shari Roseman. Fractals for Secondary Key Retrieval. Technical Report UMIACS-TR-89-47, University of Maryland, 1989. html. 5. Christos Faloutsos and Yi Rong. DOT: A Spatial Access Method Using Fractals. In: Proceedings of the Seventh International Conference on Data Engineering, April 8-12, 1991, Kobe, Japan, pages 152-159. IEEE Computer Society.

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