Efficient Answering of Historical What-if Queries
Efficient Answering of Historical What-if Queries
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高效回答历史假设查询
DOI:
10.1145/3514221.3526138
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Glavic, Boris
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文献类型:
--
作者:
Campbell, Felix S.;Arab, Bahareh Sadat;Glavic, Boris
We introduce historical what-if queries, a novel type of what-if analysis that determines the effect of a hypothetical change to the transactional history of a database. For example, "how would revenue be affected if we would have charged an additional $6 for shipping?" We develop efficient techniques for answering historical what-if queries, i.e., determining how a modified history affects the current database state. Our techniques are based on reenactment, a replay technique for transactional histories. We optimize this process using program and data slicing techniques that determine which updates and what data can be excluded from reenactment without affecting the result. Using an implementation of our techniques in Mahif (a Middleware for Answering Historical what-IF queries) we demonstrate their effectiveness experimentally.
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DOI:
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发表时间:
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期刊:
SIGMOD Conference
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