654 search results - page 48 / 131 » Complexity of Answering Queries Using Materialized Views |
254
Voted
ICDE
2002
IEEE
16 years 4 months ago
2002
IEEE
With the growth of the Web, there has been a rapid increase in the number of users who need to access online databases without having a detailed knowledge of the schema or of quer...
130
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SACMAT
2005
ACM
15 years 8 months ago
2005
ACM
We investigate a generalization of the notion of XML security view introduced by Stoica and Farkas [17] and later refined by Fan et al. [8]. The model consists of access control ...
141
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GLOBE
2008
Springer
15 years 4 months ago
2008
Springer
This paper addresses the problem of data integration in a P2P environment, where each peer stores schema of its local data, mappings between the schemas, and some schema constraint...
129
Voted
VLDB
1987
ACM
15 years 6 months ago
1987
ACM
Severalmethodshavebeenproposedto compile recursive Datalog programs. The most well-known perform a rewriting of rules using MAGIC or PROBLEM predicates in order to push selections...
128
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ISAAC
2004
Springer
15 years 8 months ago
2004
Springer
We propose a space-efficient scheme for summarizing multidimensional data streams. Our sketch can be used to solve spatial versions of several classical data stream queries effici...