Noctambulant
发表于 2025-3-25 04:40:03
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Generator
发表于 2025-3-25 11:18:04
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Morbid
发表于 2025-3-25 13:35:15
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委屈
发表于 2025-3-25 17:24:25
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神化怪物
发表于 2025-3-25 20:45:48
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补角
发表于 2025-3-26 03:42:33
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BATE
发表于 2025-3-26 06:05:39
Distributed query optimization in loosely coupled multidatabase systems,ion process is organized as a sequence of steps, in which at each step all . work in parallel to evaluate the cost of execution plans for partial queries of increasing size, and send their cost estimates to the other . that need them for the next step. The computation is totally distributed, and org
Vital-Signs
发表于 2025-3-26 08:29:49
On the complexity of generating optimal left-deep processing trees with cross products,marizing the intermediate result sizes has the ASI property. It further motivates us to restrict the subsequent investigations to this cost function called .. for which we show that the problem remains NP-complete in the general case..Then, we concentrate on the main topic of the paper: the complexi
Venules
发表于 2025-3-26 15:04:07
Querying disjunctive databases through nonmonotonic logics, autoepistemic logic and some of their fragments express the same class of Boolean queries, which turns out to be a strict subclass of the ..-recognizable Boolean queries. Then we prove that under the assumption that the database consists of clauses whose length is bound by some constant, default lo
maroon
发表于 2025-3-26 19:14:58
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