该命令在一张表或者索引了的视图上更新查询优化统计数字信息. 默认情况下, 查询优化器已经更新了必要的用来提高查询计划的统计信息; 在某些情况下, 你可以通过使用UPDATE STATISTICS 命令或者存储过程sp_updatestats 来比默认更频繁地更新统计信息来提高查询效率. 更新统计信息能确保查询能以最新的统计信息来编译. 然而, 更新统计信息会引起查询的重新编译. 我们建议不要过于频繁地更新统计信息, 因为这里有一个在提高查询计划和用来重新编译查询的权衡. 具体的权衡要看你的应用程…

Solr In Action 笔记(1) 之 Key Solr Concepts 题记:看了下<Solr In Action>还是收益良多的,只是奈何没有中文版,只能查看英语原版有点类,第一次看整本的英语书,就当复习下英语并顺便做下笔记吧. 1. Solr的框架 从这张图上看Solr的组件还是很齐全以及清楚明了的,但是当你看Solr源码的时候就会发现,哎呀咋看起来这么类呢. 2. Solr的查询方式 上面两张图分别举例了Solr的几个QueryComponent,比如facet,More li…

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1.Normal distribution In probability theory, the normal (or Gaussian or Gauss or Laplace–Gauss) distribution is a very common continuous probability distribution. Normal distributions are important in statistics and are often used in the natural and…

What Is Mathematics? The National Council of Teachers of Mathematics (NCTM), the world's largest organization devoted to improving mathematics education, is developing a set of mathematics concepts, or standards, that are important for teaching and l…

https://www.quora.com/How-do-I-learn-mathematics-for-machine-learning   How do I learn mathematics for machine learning? Promoted by Time Doctor Software for productivity tracking. Time tracking and productivity improvement software with screenshots…

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What's the most effective way to get started with deep learning?       29 Answers     Yoshua Bengio, My lab has been one of the three that started the deep learning approach, back in 2006, along with Hinton's... Answered Jan 20, 2016   Originally Ans…

Problems[show] Classification Clustering Regression Anomaly detection Association rules Reinforcement learning Structured prediction Feature engineering Feature learning Online learning Semi-supervised learning Unsupervised learning Learning to rank…

I joined Analytics Vidhya as an intern last summer. I had no clue what was in store for me. I had been following the blog for some time and liked the community, but did not know what to expect as an intern. The initial few days were good – all the in…