Balancing Expressiveness and Inexpressiveness in View Design

Balancing Expressiveness and Inexpressiveness in View Design
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平衡视图设计中的表现力和非表现力

DOI:
10.1145/3488370
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发表时间:
2021
影响因子:
1.8
通讯作者:
Benedikt M
Benedikt M
中科院分区:
计算机科学3区
文献类型:
--
作者:
Benedikt M

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我们研究的数据发布机制的设计,允许一个自治的分布式数据源的集合,合作,以支持查询。数据发布的一种常见机制是viaviews:向用户公开派生数据的函数,通常指定为声明性查询。我们的自治假设是,意见必须对个别来源,但与意图支持集成查询。在决定向用户公开哪些数据时,必须平衡两个考虑因素。视图必须有足够的表达能力来支持用户想要询问的查询--这就是发布机制的效用。但也可能存在一些表达限制。在这里,我们考虑两个限制,最小信息要求,即视图应尽可能少地显示,同时支持实用程序查询,以及非确定性要求,形式化需要防止外部用户计算数据所有者不希望显示的信息。我们调查的问题,设计的意见,满足表现力和非表现力的要求,在一个受限的信息系统的意见-查询语言(合取查询),并为任意视图。
We study the design of data publishing mechanisms that allow a collection of autonomous distributed data sources to collaborate to support queries. A common mechanism for data publishing is viaviews: functions that expose derived data to users, usually specified as declarative queries. Our autonomy assumption is that the views must be on individual sources, but with the intention of supporting integrated queries. In deciding what data to expose to users, two considerations must be balanced. The views must be sufficiently expressive to support queries that users want to ask—theutilityof the publishing mechanism. But there may also be some expressiveness restrictions. Here, we consider two restrictions, aminimal informationrequirement, saying that the views should reveal as little as possible while supporting the utility query, and anon-disclosurerequirement, formalizing the need to prevent external users from computing information that data owners do not want revealed. We investigate the problem of designing views that satisfy both expressiveness and inexpressiveness requirements, for views in a restricted information systems - query languages (conjunctive queries), and for arbitrary views.
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