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cost of retry is very large, for example, the report statistics operations need to calculate a few hours or even a day that should adopt the locking mechanism to avoid retry.From the above analysis. We can simply conclude that the response speed and concurrency requirements for reading are better suited for MVCC, while the more expensive scenes of retry are more suitable for pessimistic locking mechanisms.SummarizeThis paper introduces a method of conditional update to solve the concurrency con

difficult to write a simple web crawler first to collect the data and then display it to the command line or store it in the database.GitHub---------Https://github.com/REMitchell/python-scraping-------------Screen ScrapingData miningWeb Harvesting-------------Bots robot--------If the only way you surf the Internet is with a browserThen you've lost a lot of possibilities.The API of Twitter or Wikipedia discovers that an API provides different data typ

interest and support in this series. ResourcesLearn Cluster Analysis: Introduction to Wikipedia on clustering analysis Data mining: Concept and Technology (Han Jiawei): The Classic of data mining, introduces the various problems and applications in data mining, in which the classical algorithm of clustering analysis is also explained in detail. Data mining: Practical machine learning technology: Also is the classic of data mining, the doma

Here are some of the more important algorithms, the original list of 32, but I think there are many number theory, and the computer is irrelevant, so there is no choice. The following, some of which we often use, and some basic use. Some are very common, some are very biased. But it's good to know. You are also welcome to leave an algorithm that you feel is meaningful. (Note: This article is not a translation, and most of the algorithmic descriptions are excerpted from

Recently in the preparation of a book management program, need to check the book ISBN correct, check some information, understand the book ISBN code composition, detailed information can refer to: ISBN-wikipedia, below or briefly what is the ISBN code: ISBN (International Standard book NUMBER,ISBN, Is-ben), is the international general books or independent publications (except periodical published periodicals) code. Publishers can clearly identify al

Reprint: http://linbingdong.com/2017/04/17/%E5%88%86%E5%B8%83%E5%BC%8F%E7%B3%BB%E5%88%97%E6%96%87%E7%AB%A0%E2%80%94% e2%80%94paxos%e7%ae%97%e6%b3%95%e5%8e%9f%e7%90%86%e4%b8%8e%e6%8e%a8%e5%af%bc/The Paxos algorithm has a very important position in the distributed field. But the Paxos algorithm has two obvious drawbacks: 1. Difficult to understand 2. Engineering is more difficult to achieve.There are many articles on the Internet that explain the Paxos algorithm, but the quality is uneven. Read a

gives a small preview? Do I have to click the Preview button again in the Standard Preview dialog box? I don't want to start the preview to see the preview, especially since it's not really a preview. I want it in the Print dialog box. But leopard a nice big preview every time I need to print, and I don't have to complain. A better script Automator has two new features that can help skilled scripting people, as well as someone like me, to write more efficient scripting, and we can use scripti

Baidu Wikipedia weight believes that needless to say that everyone is very clear, get a few encyclopedia of the connection to improve the weight of the site is also very obvious, but the encyclopedia is also a certain degree of difficulty, the following to share their own encyclopedia summed up some of the experience and skills to everyone. 1. Create or modify entries in high quality The richer the content you get, the greater the chance of a connec

Xiao ran Dugu fly once in keywords density actual combat skills – analyze competitors Choose the best density >> article to introduce keyword density reasonable choice, mentioned Baidu Encyclopedia is a master of optimization, we should to Baidu hundred scientific optimization skills, Today on the key to introduce, how we to Baidu Encyclopedia to learn SEO optimization techniques. I do not know whether the webmaster has found that we want to query some of the relevant keywords will always appea

will not edit the encyclopedia, in the Interactive Encyclopedia, Baidu Encyclopedia, Soso Encyclopedia to find other wikipedia on the Wikipedia has no entry, for example, some of the entries in the Baidu Encyclopedia there is no soso encyclopedia, we can take these encyclopedia pictures or content to get their own website, Then add an encyclopedia on the Wikipedia