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A sudden whim wants to implement a PHP-based communication software, compared with the traditional socket-based communication software. Disadvantage: Non-real-time communication, passive transfer of data server, higher operating costs. Advanta ...

View system variables:1.env command [root@localhost ~]# env 2.set command [root@localhost ~]# set *set can display user-defined variables Custom variables: 1. Define variables: [root@localhost ~]# a=test [root@localhost ~]# echo $a test 2. Naming rules for variables: can include upper and lower case letters, numbers, underscores (cannot start ...

Spring automatic assembly xml file <bean id="address" class="com.atguigu.spring.beans.autowire.Address" p:city="BeiJing" p:street="HuiLongGuan"> </bean> <bean id="address2" class="com.atguigu.spring.beans.autowire.Address" p ...

PHP+Nginx Environment Setup Author: Mirror ^^ Reference article: ​ Nginx+PHP+MySQL Installation Reference ​ PHP Source Installation Experience ​ Common problems in PHP source environment building CentOS environment Configure the CentOS-7 network: CentOS (minimum installation) does not open the network by default Start the network vi Open: / ...

One: MySQL master-slave configuration 1: MySQL master-slave backup 1.1: Master-slave backup concept What is master-slave backup: a database application of master-slave mode. Master data is identical with Slave data, which can realize multiple ...

SpringBoot e-commerce project mall (20k+star) address: https://github.com/macrozheng/mall abstract Docker Compose is a tool for defining and running multiple docker container applications. With Compose, you can configure your application services with YAML files, and then with a command, you can deploy all the services you configure. install D ...

-- Example table CREATE TABLE `employees` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(24) NOT NULL DEFAULT '' COMMENT 'Full name', `age` int(20) NOT NULL DEFAULT '0' COMMENT 'Age', `position` varchar(20) NOT NULL DEFAULT '' COMMENT 'position', `hire_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMEST ...

Let's start by describing what problems would be caused to our cache in the case of high concurrency? 1. Cache Breakdown: In the case of high concurrency, when a hot key fails, a large number of requests will be made to access our data, such as when a commodity is killed in seconds. 2. Cache avalanche: refers to a time when a large number of ke ...

Complete Handbook of C Language Self-study (33 articles) Android Multiresolution Adaptation Framework HTML5 Front-end Development Practical Course Series MySQL Database Practical Tutorial (35 Graphics Edition) Overthrow Yourself and Past - Custom Vi ...

There are two ways to subtable a database vertical partitioning A database consists of many tables, each of which corresponds to a different business. Vertical slicing refers to classifying tables by business and distributing them over different databases, thus sharing data or pressure among different libraries.Advantage: - Clear business an ...