Tag：Number of users
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[basic] performance test, from 0 to actual combat (hands-on teaching, very practical)
1、 Performance basis What is the essence of performance testing — >? Simulate the request sent by the user based on the protocol (service simulation),To serverForm a certain load.Focus:Time performance、Spatial performanceInterface independent Performance test classification Performance test (narrow sense) The performance test method is to test whether the system performance meets the production performance requirements […]
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Load test, concurrent test and stress test
Load test 1. Definition:Load test is to test the change of system performance by gradually increasing the system load, and finally determine the maximum load that the system can bear under the condition of meeting the performance index. 2. Purpose:The test without hanging the system enables the system to operate normally under the maximum pressure. […]
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Construction of three data warehouses in the actual combat of shangsilicon Valley data warehouse
@TOC Warehouse notes Detailed explanation of data warehouse and data mart: ODS, DW, DWD, DWM, DWS, ads:https://blog.csdn.net/weixin_42526326/article/details/121633372 Project requirements and architecture design of shangsilicon Valley digital warehouse practice 1:https://blog.csdn.net/weixin_42526326/article/details/121658388 Shang Silicon Valley digital warehouse actual combat 2 digital warehouse layered + dimensional modeling:https://blog.csdn.net/weixin_42526326/article/details/121658605 Construction of 3 digital warehouses in the actual combat of shangsilicon Valley:https://blog.csdn.net/weixin_42526326/article/details/121658635 […]
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Five questions and three strategies to teach you how to customize app performance monitoring scheme
Author: Youmeng + u-apm team Why? Why should we do application performance monitoring? First, we need to know what application performance monitoring specifically refers to? And purpose: Monitoring is a complete set of “monitoring + alarm” system. For app developers like us, application performance monitoring is the first hurdle to measure the app. If the […]
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Mybatis plus SQL Server paging query
Springboot demo project: POM <!– MyBatis-Plus –> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.3.4</version> </dependency> <!– SQL Server driver — > <dependency> <groupId>com.microsoft.sqlserver</groupId> <artifactId>sqljdbc4</artifactId> <version>4.0</version> </dependency> Config MyBatisPlusConfig.java @Configuration @MapperScan(“com.qinhaoran.mpdemo.mapper”) public class MybatisPlusConfig { @Bean public MybatisPlusInterceptor mybatisPlusInterceptor() { MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor(); interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.SQL_SERVER)); return interceptor; } } application.yml # DataSource Config spring: datasource: driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver […]
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Windows shares files from the command line
Basic syntax: net share sharename=folderpath /grant:username,permissions Sharename: the name of the share to be created Username: the ID of the user who can access the shared folder Permission: permission to access the shared folder: read, change or full For example: Share the folder e: \ documents with everyone in the domain and grant full […]
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Don’t know what nginx is? One article will give you a comprehensive understanding
The globalization of the Internet has led to the rapid growth of the amount of data on the Internet. In order to cope with the large number of Internet users in Shanghai and easily handle millions and tens of millions of connections, nginx came into being. If you don’t understand what nginx is, you must […]
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Using Zset of redis to count online user information in springboot
Counting the number of online users is a common requirement for applications. If it is necessary to accurately count whether the user is online or offline, I think only the client and server can maintain a long TCP connection. If the application itself is not an IM application, the cost of this method is very […]
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Five questions, three strategies, hand in hand teach you to customize app performance monitoring scheme
Introduction:To sum up, we can count the number of errors, error rate, number of affected users, proportion of affected users and other indicators of different types of errors in a certain time range. In the detailed classification of indicators, we can also define monitoring with different dimensions, such as version number. Author: Youmeng + u-apm […]
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One of the common wrong analysis ideas about rate index in Statistical Science
Today, I would like to share with you a mistake that may be made in the process of data analysis. In fact, many new people will make this problem, and some old people will make it, and they often don’t know when they are wrong. It happens that some readers are asking similar questions, so […]
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How powerful is big data for operators?
It’s not too much to say that data is money. Even if an Internet company loses money for a long time, as long as there are a large number of users as support, there will be investors to invest in venture capital. Big data of operators is relatively better than big data of Internet. Big […]
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What should I do if the service is abnormal? Recommend a super practical handling guide to you
1. Service exception handling process 2. Load 2.1 check the load of the machine CPU top -b -n 1 |grep java|awk ‘{print “VIRT:”$5,”RES:”$6,”cpu:”$9″%”,”mem:”$10″%”}’ 2.2 finding threads with high CPU utilization top -p 25603 -H printf 0x%x 25842 jstack 25603 | grep 0x64f2 cat /proc/interrupts （1）CPU （2）Memory （3）IO （4）Network The CPU information can be monitored from the following aspects:(1) Interruption;(2) Context switching;(3) Runnable queue;(4) CPU utilization. 3. […]