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ICDT
2009
ACM
14 years 9 months ago
2009
ACM
The class of unions of conjunctive queries (UCQ) has been shown to be particularly well-behaved for data exchange; its certain answers can be computed in polynomial time (in terms...
EDBT
2002
ACM
14 years 9 months ago
2002
ACM
Abstract. Estimating the sizes of query results, and intermediate results, is crucial to many aspects of query processing. In particular, it is necessary for effective query optimi...
SAG
2004
Springer
14 years 2 months ago
2004
Springer
Grid workflows can be seen as special scientific workflows involving high performance and/or high throughput computational tasks. Much work in grid workflows has focused on improvi...
SIGMOD
2007
ACM
14 years 9 months ago
2007
ACM
Partial evaluation has recently proven an effective technique for evaluating Boolean XPath queries over a fragmented tree that is distributed over a number of sites. What left ope...
SIGMOD
1996
ACM
14 years 1 months ago
1996
ACM
Magic sets rewriting is a well-known optimization heuristic for complex decision-support queries. There can be many variants of this rewriting even for a single query, which diffe...