373 search results - page 4 / 75 » Querying Priced Information in Databases: The Conjunctive Ca... |
AMW
2009
14 years 10 months ago
2009
Abstract. Rewriting of conjunctive queries using views has many applications in database and data integration. We investigate ways to improve performance of rewriting and propose a...
VLDB
2005
ACM
15 years 3 months ago
2005
ACM
Cost-based query optimizers need to estimate the selectivity of conjunctive predicates when comparing alternative query execution plans. To this end, advanced optimizers use multi...
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ICDT
2009
ACM
15 years 10 months ago
2009
ACM
We study the problem of querying data sources that accept only a limited set of queries, such as sources accessible by Web services which can implement very large (potentially inf...
STOC
2005
ACM
15 years 3 months ago
2005
ACM
This paper focuses on competitive function evaluation in the context of computing with priced information. A function f is given together with a cost cx for each variable x of f. ...
PODS
2000
ACM
15 years 1 months ago
2000
ACM
The problem of query containment is fundamental to many aspects of database systems, including query optimization, determining independence of queries from updates, and rewriting ...