620 search results - page 24 / 124 » Algorithms for Rewriting Aggregate Queries Using Views |
150
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DBPL
2001
Springer
15 years 7 months ago
2001
Springer
Abstract. We are interested in the theoretical foundations of the optimization of conjunctive regular path queries (CRPQs). The basic problem here is deciding query containment bot...
225
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SIGMOD
2007
ACM
16 years 2 months ago
2007
ACM
Translating data and data access operations between applications and databases is a longstanding data management problem. We present a novel approach to this problem, in which the...
134
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TKDE
2002
15 years 2 months ago
2002
The construction and maintenance of data warehouses (views) in large-scale environments composed of numerous distributed and evolving information sources (ISs) such as the WWW has ...
125
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CIKM
2004
Springer
15 years 8 months ago
2004
Springer
At present, most of the state-of-the-art solutions for XML access controls are either (1) document-level access control techniques that are too limited to support fine-grained sec...
112
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DMDW
2000
15 years 4 months ago
2000
As views in a data warehouse become more complex, the view maintenance process can become very complicated and potentially very inefficient. Storing auxiliary views in the warehou...