منابع مشابه
Optimal Security-Aware Query Processing
Security-Aware Query Processing is the problem of computing answers to queries in the presence of access control policies. We present general impossibility results for the existence of optimal algorithms for Security-Aware Query Processing and classify query languages for which such algorithms exist. In particular, we show that for the relational calculus there are no optimal algorithms, wherea...
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In the environment of wide-area networks such as the Internet, distributed query processing becomes problematic due to the changing coming from both underlying networks and user’s requirements. In this new context, conventional query processing strategies with the homogeneous assumption will not work well, because they are unable to adapt to unexpected changes in the performance of the communic...
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We introduce a multidatabase model to represent the information that derives from different local databases. This model, known as Tuple-Source (TS) relational model, accommodates tuples from diierent local databases by attaching them with their source information in the global relations which are also known as TS-relations. In other words, a source attribute is implicit in every TS-relation. To...
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Recent advances in hardware technology make applications requiring large numbers of sensor devices possible, where each sensor device has computation, memory, and communication capabilities. Since sensor devices are powered by ordinary batteries, power is a limiting resource in sensor networks. Some work has been proposed to reduce the power usage by pushing part of the computation into the net...
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ژورنال
عنوان ژورنال: Proceedings of the VLDB Endowment
سال: 2014
ISSN: 2150-8097
DOI: 10.14778/2732977.2733003