all rows from client_id can grow infinitely compared to a single node when hashing by client_id Re: [pingcap/tidb] Performance comparison between TiDb and Vitess(#7160) Because of the range-sharding, many joins/inserts/updates/deletes become cross-no…

A Complete Tutorial on Tree Based Modeling from Scratch (in R & Python) MACHINE LEARNING PYTHON R   SHARE      MANISH SARASWAT, APRIL 12, 2016 / 52     Introduction Tree based learning algorithms are considered to be one of the best and mostly used s…

Complete list of Microsoft SQL Server trace flags (585 trace flags) REMEMBER: Be extremely careful with trace flags, test in your test environment first. And consult professionals first if you are the slightest uncertain about the effects of your cha…

文章来自:http://freetds.cvs.sourceforge.net/*checkout*/freetds/freetds/doc/tds.html 该网站是免费的专门介绍TDS协议的,网址是:http://www.freetds.org/ 页面是我贴过来的,部分跳转有些问题,有兴趣的可以直接浏览原页面. This document attempts to cover the TDS protocol for: TDS Version Supported Products 4.2 Sy…

A novel massively parallel supercomputer of hundreds of teraOPS-scale includes node architectures based upon System-On-a-Chip technology, i.e., each processing node comprises a single Application Specific Integrated Circuit (ASIC). Within each ASIC n…

Segregate operations that read data from operations that update data by using separate interfaces. This pattern can maximize performance, scalability, and security; support evolution of the system over time through higher flexibility; and prevent upd…

mysql当插入重复时更新的方法: 第一种方法: 示例一:插入多条记录 假设有一个主键为 client_id 的 clients 表,可以使用下面的语句: INSERT INTO clients (client_id,client_name,client_type) SELECT supplier_id,supplier_name,'advertising' FROM suppliers WHERE not exists(select * from clients where clients.c…

Transistor Tutorial Summary Transistor Tutorial Summary Bipolar Junction Transistor Tutorial We can summarise this transistors tutorial section as follows: The Bipolar Junction Transistor (BJT) is a three layer device constructed form two semiconduct…

最近想学习一下libevent,就先翻译一下libevent的官方文档吧. 英文原文链接:http://www.wangafu.net/~nickm/libevent-book/01_intro.html 大部分编程初学者都是从阻塞IO开始的.何谓阻塞IO?,即你进行一个IO调用时,除非这个操作完成,或者超时网络协议栈放弃了,否则这个调用是不返回的.比如你对TCP连接调用“connect()”时,你的操作系统将发送一个SYN包给TCP连接的对端,除非收到对端发送的SYN ACK包或者是超时了,否…

手机自动化测试:Appium源码分析之跟踪代码分析九   poptest是国内唯一一家培养测试开发工程师的培训机构,以学员能胜任自动化测试,性能测试,测试工具开发等工作为目标.如果对课程感兴趣,请大家咨询qq:908821478. // set up distributed logging before everything else var npmlog = global._global_npmlog = require('npmlog'); // npmlog is used only fo…