Uncertainty Annotated Databases - A Lightweight Approach for Approximating Certain Answers
Uncertainty Annotated Databases - A Lightweight Approach for Approximating Certain Answers
复制标题
不确定性注释数据库 - 近似某些答案的轻量级方法
DOI:
10.1145/3299869.3319887
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Kennedy, Oliver
中科院分区:
文献类型:
--
作者:
Feng, Su;Huber, Aaron;Glavic, Boris;Kennedy, Oliver
Certain answers are a principled method for coping with uncertainty that arises in many practical data management tasks. Unfortunately, this method is expensive and may ex- clude useful (if uncertain) answers. Thus, users frequently resort to less principled approaches to resolve uncertainty. In this paper, we propose Uncertainty Annotated Databases (UA-DBs), which combine an under- and over-approximation of certain answers to achieve the reliability of certain answers, with the performance of a classical database system. Furthermore, in contrast to prior work on certain answers, UA-DBs achieve a higher utility by including some (explicitly marked) answers that are not certain. UA-DBs are based on incomplete K-relations, which we introduce to generalize the classical set-based notion of incomplete databases and certain answers to a much larger class of data models. Using an implementation of our approach, we demonstrate experimentally that it efficiently produces tight approximations of certain answers that are of high utility.
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DOI:
10.1145/1989323.1989481
发表时间:
2011
期刊:
ACM Trans. Database Syst.
影响因子:
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作者:
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期刊:
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发表时间:
2018
期刊:
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影响因子:
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作者:
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通讯作者:
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DOI:
10.1007/978-3-319-77525-8_100350
发表时间:
2019
期刊:
Encyclopedia of Big Data Technologies
影响因子:
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作者:
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