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Introduction to MHA architecture MHA is the abbreviation of Master High Availability. It is a relatively mature solution for MySQL high availability at present. Its core is a set of scripts written in perl language. It is an excellent set of high availability software for failover and master-slave promotion in MySQL high availability environme ...

Original address: http://www.work100.net/training/monolithic-architecture-design-patterns-memento-pattern.html More tutorials: Beam cloud - free course Memo mode Serial number Chapter in text video 1 Summary 2 Realization Please refer to the navigation above for reading 1. overview Memo ...

(1) Database creation 1) Database classification System database and user database; distinguish database type by viewing object Explorer; Note: the master database should not be moved. This is the database of the database. We mainly study the user database; 2) User database file composition T ...

12:59:22, February 1, 2020 The epidemic continues, disrupting many of my plans It's also good to study at home     Introduction to JdbcTemplate Spring encapsulates the operation of database deeply on jdbc. With spring's injection function, DataSource can be registered in JdbcTemplate. The Jdbc ...

/****** ******/ //Initialization data create table employee (empid int, deptid int, salary decimal(10, 2)) insert into employee values(1, 10, 5500.00) insert into employee values(2, 10, 4500.00) insert into employee values(3, 20, 1900.00) insert into employee values(4, 20, 4800.00) insert into employee values(5, 40, 6500.00) insert ...

Interaction requirements: improve the background interaction of information page, redux sends update data request to realize asynchronous update of user data of state tree, detects whether information supplement has been completed each time when entering the perfect information page, if it has been completed, directly jump to t ...

After these days of learning, I have learned some basic knowledge about Struts. Here, I use Struts 2 to realize user registration and login, which helps us to better understand some working mechanisms of Struts. First of all, import the necessary jar package of Struts2 and add configuration information in the web.xml configura ...

aop + annotation for unified logging In development, we may need to log exceptions.Because exceptions are scattered, exceptions can occur for each service method, and many duplicate codes can occur and be difficult to maintain if we all handle them.This scenario should think of aop, aop appears to solve such problems. We can customize a comm ...

Preface Before learning to operate MYSQL database with JAVA program, we need to download and configure it Eclipse and jdk1.8 , and the tools most needed this time: MySQL database and JDBC driver Download driver jdbc 8.0.11 download website: https://dev.mysql.com/downloads/connector/j/ Load driver Open eclipse and righ ...

First, let's look at a parameter that affects the recovery time of the database SYS@ orcl>show parameter mttr NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ fast_start_mttr_target integer 0 This parameter affects the ...