Programmer Think

Operating environment: Development tools: IDEA /Eclipse Database: mysql5 seven Application service: Tomcat7/Tomcat8 Using framework: Spring + spring MVC + mybatis Project introduction With the increasing number of college students in China, it is one of the main problems studied by many educators if college students can better develop corres ...

First understand MySQL startup mode MySQL startup needs to set the password, so go to the official to check the startup command. MySQL dockerhub address: https://registry.hub.docker.com/_/mysql # Pipe sail test run command $ docker run --name some-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:tag # Parameter analysis -e Represents t ...

background We encountered 10000 concurrency per second in production at Christmas. After WAF combined with relevant log analysis, we found that several interfaces in our applet were flooded by people. For these interfaces, our front-end uses varnish for caching. Theoretically, they should all be returned in milliseconds. Should not cause to ...

1. Backup data with mysqldump command MySQL provides a convenient tool mysqldump for exporting database data and files from the command line. We can directly export the database content through the command line. First, let's briefly understand the usage of mysqldump command: mysqldump -u root -p --databases Database 1 database 2 > xxx.sql ...

Single point disadvantages and Solutions redis can be a single machine, a single process, or a cache database. The persistence method can be through rdb and aof. Single machine deployment has three disadvantages: single point of failure; Limited capacity; Too many visits can be stressful. In order to solve the disadvantages of single machine d ...

1. Installation instructions Building MySQL master-slave replication in Windows is purely for the convenience of development and testingDelete the MySQL configuration in the environment variable, including pathIf a MySQL has been installed on the computer before installing the slave database, do not copy the previously used installation pa ...

1.5.sql optimization 1.5.1. Check the execution frequency of sql After the MySQL client is successfully connected, you can view the server status information through the show [session|global] status command. You can view the main operation types on the current database by viewing the status information. --The following command displays the ...

The article has been included in my warehouse: Java learning notes SPI mechanism and JDBC break parental delegation This paper is based on jdk 11 SPI mechanism brief introduction What is SPI mechanism? The full name of SPI in Java is Service Provider Interface. It is a built-in service provision discovery mechanism in JDK. It is ...

State definition Thread pool ThreadPoolExecutor has two properties: running state and number of threads. The number of threads is easy to understand, that is, how many threads are in the pool; There are five operating states, namely RUNNING: In operation, Is the initial state, that is, the thread pool just created is in this state. SHUTDOWN: ...

When different threads in the same process operate to share resources, we only need to lock the resources. For example, we can ensure the correctness of the operation by using the tools under JUC. Students unfamiliar with JUC can read the following articles: On SynchronizedSynchronized optimizationFoundation stone of JUC - Unsafe class Howev ...