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高并发服务端分布式系统设计概要 - C/C++ - 清泛网 - 专注C/C++及内核技术

...,SNS,广告推送,邮件等有大量线上并发请求的场景。 如何抗大流量高并发?(不要告诉我把服务器买的再好一点)说起来很简单,就是“分”,如何“分”,简单的说就是把不同的业务分拆到不同的服务器上去跑(垂直拆分...
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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术

...章,读者不仅可以了解 ulimit 所起的作用,并且可以学会如何更好地通过 ulimit 限制资源的使用来改善系统性能。 概述 系统性能一直是一个受关注的话题,如何通过最简单的设置来实现最有效的性能调优,如何在有限资源的...
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WhatsApp如何成为销售钻戒的店面? - 资讯 - 清泛网 - 专注C/C++及内核技术

WhatsApp如何成为销售钻戒的店面?Rare Pink CEO尼古拉·皮瑞安科夫。他的一些顾客将跟他在WhatsApp上的销售人员一道,经历设计和选择婚戒的整个过程。购买钻石结婚戒指不... Rare Pink CEO尼古拉·皮瑞安科夫。他的一些顾客将跟他在...
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How do I check if an index exists on a table field in MySQL?

... Use SHOW INDEX like so: SHOW INDEX FROM [tablename] Docs: https://dev.mysql.com/doc/refman/5.0/en/show-index.html share | improve this answer | follow | ...
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Windows: XAMPP vs WampServer vs EasyPHP vs alternative [closed]

...o, but I want to open it up further to include all possible Windows/Apache/MySQL/PHP stacks. 5 Answers ...
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Can you attach Amazon EBS to multiple instances?

We currently use multiple webservers accessing one mysql server and fileserver. Looking at moving to the cloud, can I use this same setup and attach the EBS to multiple machine instances or what's another solution? ...
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Possible to perform cross-database queries with PostgreSQL?

... If you're coming from a MySQL environment, what MySQL calls databases are really schemas (CREATE SCHEMA == CREATE DATABASE in MySQL), so if you porting something from MySQL using multiple databases, use schemas – MkV ...
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How can I implement a tree in Python?

... self.right = None self.data = None You can use it like this: root = Tree() root.data = "root" root.left = Tree() root.left.data = "left" root.right = Tree() root.right.data = "right" If you need an arbitrary number of children per node, then use a list of children: class Tree: def...
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Best way to do multi-row insert in Oracle?

...rform multi-row inserts into an Oracle 9 database. The following works in MySQL but doesn't seem to be supported in Oracle. ...
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界面布局组件 · App Inventor 2 中文网

... 属性 水平对齐 一个数字,用于表示水平布局的内容如何水平对齐。选择分别是: 1 (左对齐) 2 (右对齐) 3 (水平居中) 如果水平布局的宽度是自动,则对齐方式无效。 垂直对齐 一个数字,用于表...