By Richard Hull, Bharat Kumar, Arnaud Sahuguet, Ming Xiong (auth.), Barry Eaglestone, Siobhán North, Alexandra Poulovassilis (eds.)

This publication constitutes the refereed complaints of the nineteenth British nationwide convention on Databases, BNCOD 2002, held in Sheffield, united kingdom, in July 2002.
The 10 revised complete papers and nine posters awarded including one invited paper have been rigorously reviewed and chosen for inclusion within the quantity. The e-book bargains topical sections on question processing, facts warehousing and information mining, caliber and integrity, and internet and allotted databases.

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Extra resources for Advances in Databases: 19th British National Conference on Databases, BNCOD 19 Sheffield, UK, July 17–19, 2002 Proceedings

Example text

Now we test whether queries rewritten with Technique II are faster than the original queries. To test hypothesis 2, the following four JE-rewritable queries were used. 1. 2. 3. 4. B From R as R1 Each query was rewritten as follows: 1. A=constant 2. B=constant 3. B 4. B From (Select A,B From RAB Union All Select A,B From Rc) as R1 Figure 4 shows the results for Queries 1 and 2; figure 5 shows the results for Query 3. For Queries 1 and 2, we see that the rewritten queries perform better than the original query when the size of the correction is small.

A dynamic query processing architecture for data integration systems. IEEE Data Engineering Bulletin, 23(2):42–48, 2000. 7. L. Bouganim, F. Fabret, C. Mohan, and P. Valduriez. Dynamic query scheduling in data integration systems. In Proc. of ICDE 2000, pages 425–434, 2000. 8. I. Foster and C. Kesselman. The Grid: Blueprint for a New Computing Infrastructure. , 1999. 9. P. Haas and J. Hellerstein. Ripple joins for online aggregation. In Proc. of ACM SIGMOD 1999, pages 287–298, 1999. 10. A. Hameurlain and F.

Theorem 1, part 1 provides the foundation of our first rewriting technique (illustrated by the following example). A = 0. Expressed in bag RA terms, Q := Π A,B (σA=0 (R)). If the HV decomposition rAB , rAC , rc is kept in the database, then, by Theorem 1, part 1, we have Q(r) = ˆ rc )). A = 0. e. the rewritten query is well-formed (no schema conflicts) and, when handed to the DBMS query evaluator, produces exactly the same result as the rewritten query. g. “R as R2”), then each occurrence of R is replaced as above.

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