712 search results - page 45 / 143 » Decoupled Query Optimization for Federated Database Systems |
217
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ICDT
2011
ACM
14 years 5 months ago
2011
ACM
Distributed data management systems consist of peers that store, exchange and process data in order to collaboratively achieve a common goal, such as evaluate some query. We study...
132
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SIGMOD
2011
ACM
14 years 4 months ago
2011
ACM
In this paper we consider the problem of answering queries using views, which is important for data integration, query optimization, and data warehouses. We consider its simplest ...
189
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ICDE
2000
IEEE
16 years 3 months ago
2000
IEEE
Execution plans produced by traditional query optimizers for data integration queries may yield poor performance for several reasons. The cost estimates may be inaccurate, the mem...
203
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SIGMOD
2007
ACM
16 years 2 months ago
2007
ACM
Complex queries often contain common or similar subexpressions, either within a single query or among multiple queries submitted as a batch. If so, query execution time can be imp...
VLDB
1998
ACM
15 years 6 months ago
1998
ACM
Users often can not easily express their queries. For example, in a multimedia image by content setting, the user might want photographs with sunsets; in current systems, like QBI...