Kukjin Lee, A. König, Vivek R. Narasayya, Bolin Ding, S. Chaudhuri, Brent Ellwein, Alexey Eksarevskiy, Manbeen Kohli, Jacob Wyant, Praneeta Prakash, Rimma V. Nehme, Jiexing Li, J. Naughton
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引用次数: 23
摘要
我们描述了Microsoft SQL Server 2016中新的实时查询统计(LQS)功能的设计和实现。该功能包括显示总体查询进度以及查询执行计划中单个操作符的进度。我们描述了LQS的整体功能，给出了使用示例，并详细介绍了我们必须扩展当前最先进技术以构建完整LQS功能的所有领域。最后，我们通过一系列使用大量合成和真实工作负载的实验来评估这些扩展对进度估计精度的影响。
Operator and Query Progress Estimation in Microsoft SQL Server Live Query Statistics
We describe the design and implementation of the new Live Query Statistics (LQS) feature in Microsoft SQL Server 2016. The functionality includes the display of overall query progress as well as progress of individual operators in the query execution plan. We describe the overall functionality of LQS, give usage examples and detail all areas where we had to extend the current state-of-the-art to build the complete LQS feature. Finally, we evaluate the effect these extensions have on progress estimation accuracy with a series of experiments using a large set of synthetic and real workloads.
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