MySQL practice -- master-slave replication

MySQL Practice chapter —— Master slave copy

1、 summary

​   Master slave copy Namely hold master server （Master） Upper Binary log file （binlog, All operations to modify the database are recorded ） Copied to the From the server （Slave） Last execution , Guarantee From the server The data on the and master server The data on the bring into correspondence with .

​   working process ：

• master server Change data It was recorded that Binary log file in
• From the server To start a I/O Threads adopt MySQL agreement hold master server Of Binary log file Copy to your own Relay log file （relay log） in
• From the server To start a SQL Threads perform Relay log file The content in

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Add ：I/O Threads and SQL Threads

• I/O Threads ： Responsible for reading Binary log file of the primary server , And save it as Relay log file
• SQL Threads ： perform Relay log file The content in

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2、 practice

1、 stay E disc establish master and slave Catalog

2、 Find this machine MySQL The installation path take Overall folder Compress and pack

3、 take Compressed package Copy them to master and slave Under the table of contents , And finish decompressing

4、 To configure MySQL System files for my.ini

• master Of my.ini To configure

  ​ use Notepad （ Or other editors ） open master root directory Under the my.ini, stay [mysqld] Next newly added log-bin=mysql-bin server-id=3306 and Keep close .

  [mysqld]
  log-bin=mysql-bin	#  Indicates the name of the binary log file to be generated 
  server-id=3306
  

• slave Of my.ini To configure

  ​ use Notepad （ Or other editors ） open slave root directory Under the my.ini, take [client] Next Of port（ Port number ） from 3306 Change to 3307; take [mysqld] Next Of port from 3306 Change to 3307, newly added log-bin=mysql-bin server-id=3307 and Keep close .

  [mysqld]
  log-bin=mysql-bin
  server-id=3307
  
  port=3307
  
  [client]
  port=3307
  

5、 start-up master The server , And create an account specifically for replication

• Open command window cmd, Get into master Of bin Catalog , Enter the command to start the server ：mysqld --console, Start the server

• Open command window cmd, Get into master Of bin Catalog , Input mysql -u root -p, Log in to master The server

• establish Copy accounts , user name repuser, password 123

  mysql>Create user 'repuser'@'localhost' identified by '123';
  mysql>grant replication slave on *.* to 'repuser'@'localhost';
  mysql>flush privileges;
  mysql>show master status \G 	#  Show  master  state ; \G  Display in rows , Don't add it in the back ';'
  

6、 start-up slave The server , complete slave Configuration of

• Open command window cmd, Get into slave Of bin Catalog , Enter the command to start the server ：mysqld --console, Start the server

• Open command window cmd, Get into slave Of bin Catalog , Input mysql -u root -p Log in to slave The server

• complete Master slave copy Related configuration of

  mysql>change master to master_host='localhost',master_port=3306,master='repuser',master_password='123',master_log_file='mysql-bin.000001',mastet_log_pos=0;
  

• start-up slave and Check its status

  mysql>start slave;
  mysql>show slave status \G
  

notes ： Check Slave_IO_Running Threads and Slave_SQL_Running Threads Is it all for yes, If it is , Express Master slave replication service Established ; If not , Express Master slave replication service Not established .

7、 Master slave replication test

（1） stay master client , Create a database BankDB, Once created , stay slave client Check whether there is BankDB：show databases;

DROP SCHEMA IF EXISTS BankDB ;
CREATE SCHEMA IF NOT EXISTS BankDB default character set gbk;
USE BankDB;

Create table Bank(BankID int, Cname char(20), Balance decimal(10,2));
insert into Bank values (20181211,' Zhang San ', 20000);
insert into Bank values (20181212,' Li Si ', 10000);
insert into Bank values (20181213,' Wang Wu ', 20000);

master client ：

slave client ：

（2） stay master client , modify Bank The data table , stay slave client Check whether the update is successful

update Bank set Balance=Balance + 99;

master client ：

slaver client ：

（3） stay slave Closed （slave client ：stop slave,slave Server side ：Ctrl+C）, stay master client Create a new database BankDB1; Restart slave, stay slave client Check whether the newly created database appears BankDB1

DROP SCHEMA IF EXISTS BankDB1;
CREATE SCHEMA IF NOT EXISTS BankDB1 default character set gbk;
USE BankDB1;

Create table Bank(BankID int, Cname char(20), Balance decimal(10,2));
insert into Bank values (20181211,' Zhang San ', 20000);
insert into Bank values (20181212,' Li Si ', 10000);
insert into Bank values (20181213,' Wang Wu ', 20000);

master client ：

slaver client ：