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catalogue 1, MySQL master-slave replication 1.1 master slave replication architecture and principle 1.1.1 service performance expansion mode 1.2 MySQL extension 1.2.1 what is read-write separation? 1.2.2 why is read-write separation necessary 1.2.3 when should I separate reading from writing 1.2.4 master slave copy and read / write sepa ...

scene What is Nacos Nacos is dedicated to helping you discover, configure, and manage microservices. Nacos provides a set of easy-to-use feature sets to help you quickly realize dynamic service delivery Service configuration, service metadata and flow management. Nacos helps you build, deliver, and manage microservice platforms mor ...

catalogue 1. Variable   1.1 system variables 1.1.1 classification of system variables           1.1.2. View system variables 1.2 user scalar 1.2.1 classification of user variables 1.2.2 session user variables 1.2.3 local variables 1.2.4 comparing session user variables with local variables 2. Define conditions and handlers ...

9 establishment, addition, deletion and modification of table 9.1 table creation (table creation) Syntax format of table creation: (table creation belongs to DDL statement, and DDL includes: create drop alter) create table Table name(Field name 1 data type, Field name 2 data type, Field name 3 data type); create table Table name( Field na ...

This article introduces the relevant knowledge of "how to solve the problem of obtaining timestamp from Mysql database 8 hours earlier than the normal time". In the operation process of actual cases, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can rea ...

catalogue Function Preview Back end main content Login panel Management panel Data panel    Menu bar Panel switching Operation database Main form key technology verification   Operating system process Beautify form Front end part   Registration interface jsp realizes front-end and back-end interaction Fu ...

Idea—Tomcat preparation in advance Install the applicable JDK version of TomcatIn the doc window, test Tomcat to ensure that it can be executed normally. Step 1: New Project (I'm used to creating an Empty Project first, and then creating a Module under the Empty Project. This is not necessary, but a habit. You can directly create a non ...

Introduction:   This article mainly explains how to install MariaDB / MySQL database on raspberry PI (raspberry pie) system. For image download, domain name resolution and time synchronization, please click   Alibaba open source mirror station 1, Update system Update the system you need to install by running the following comman ...

Write in front: This article is my study record. If there are mistakes, please point them out and correct them immediately DDL, DQL, DML and DCL will be written in four parts, and DQL will be written in this article. What is DQL? DQL: data query language, used to query data First, paste a table, and the following query contents will be us ...

1, SQL language classification: 1. DDL: database definition language; It is used to establish and delete databases, tables, views, etc.                 DDL includes create, alter, drop, etc. 2. DML: database manipulation language: used for adding, deleting, modifying and querying.     &nbsp ...