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.)

ISBN-10: 3540677437

ISBN-13: 9783540677437

After a decade of significant technical and theoretical developments within the zone, the scope for exploitation of database expertise hasn't ever been higher. Neither has the problem. This quantity includes the lawsuits of the seventeenth British nationwide convention on Databases (BNCOD 2000), held on the college of Exeter in July 2000. In settling on the standard papers offered right here, the programme committee was once p- ticularly drawn to the calls for being made at the know-how by way of rising software parts, together with internet functions, push know-how, multimedia facts, and knowledge warehousing. the fear is still an identical: pride of consumer - quirements on caliber and function. even though, with expanding call for for well timed entry to heterogeneous facts allotted on an unregulated net, new demanding situations are provided. Our 3 invited audio system strengthen the subject matter for the convention, contemplating new dimensions pertaining to person standards in getting access to allotted, hete- geneous details resources. within the ?rst paper awarded the following, Gio Wiederhold re?ects at the stress among necessities for, at the one hand, precision and relevance and at the different completeness and keep in mind in pertaining to facts from heterogeneous assets. In resolving this stress in favour of the previous, he keeps that this can 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 details de- vered by way of a push expertise in response to reactive services. He keeps that this calls for a paradigm shift to a user-centric view of information.

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Additional info for Advances in Databases: 17th British National Conference on Databases, BNCOD 17 Exeter, UK, July 3–5, 2000 Proceedings

Sample text

In this paper we introduce a novel architecture to bring inter-application query-optimizer back into the mainstream of research. The prime innovation is to organize the query optimization problem into three tiers: Strategic optimization, Tactical optimization and Operational optimization. At each tier, di erent sources of optimization are exploited. The strategic tier uses the application (-model) knowledge, such as foreign-key dependencies, semantic integrity constraints, and user-application focus to derive a query execution plan.

C Springer-Verlag Berlin Heidelberg 2000 Using Space-Filling Curves for Multi-dimensional Indexing 2 21 One-Dimensional File Structures With one-dimensional file structures, the record type specifies the fields or attributes which a record may contain. In one of these fields, usually termed the primary key, a value is required in all records and all values must be distinct. A characteristic of one-dimensional systems is that the primary key values are used to determine the placement of records in physical storage organized as a collection of pages, a page containing a number of records.

This product space we term the key-space and the points which correspond to actual records we term datumpoints. The key-space is divided into cuboids with each cuboid being in one-one correspondence with a page of data in physical store, the records on that page being those that correspond to the datum-points in the cuboid. When a page which becomes full is split the cuboid is split correspondingly and similarly with recombination of under-used pages. This paper left open a number of questions relating to the structuring of the index to the key-space and the choice of dimensions for splitting.

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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.)


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