167 search results - page 7 / 34 » Optimization of Query Plans in the presence of Access Limita... |
IJCAI
1997
13 years 9 months ago
1997
Generating query-answering plans for information gathering agents requires to translate a user query, formulated in terms of a set of virtual relations, to a query that uses relat...
SIGMOD
1997
ACM
13 years 11 months ago
1997
ACM
In this paper, we study a simple SQL extension that enables query writers to explicitly limit the cardinality of a query result. We examine its impact on the query optimization an...
ICDE
2007
IEEE
14 years 9 months ago
2007
IEEE
Traditional approaches for efficiently processing historical queries, where a history is a multidimensional timeseries, employ a two step filter-and-refine scheme. In the filter s...
AMW
2010
13 years 9 months ago
2010
Traditional optimizers fail to pick good execution plans, when faced with increasingly complex queries and large data sets. This failure is even more acute in the context of XQuery...
PDIS
1996
IEEE
13 years 11 months ago
1996
IEEE
Accessing data from numerous widely-distributed sources poses signi cant new challenges for query optimization and execution. Congestion and failures in the network can introduce ...