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环境模拟
实现读写分离 减轻数据库的负荷
主服务器 master 10.0.0.12
从服务器 slave 10.0.0.66
------------------------------------------------------------------------------------------------------------------------
配置主服务器: 在10.0.0.12服务器操作
创建数据库
create database mydemo;
1.修改配置文件
vi /etc/my.cnf
在[mysqld] 后面添加下面的代码
sync_binlog=1binlog-do-db=mydemo #设置需要同步的数据库名binlog_ignore_db=mysql #不需要同步的数据库 如果有多个不需要同步则依次列出# binlog_ignore_db=xxxx 保存退出 :wq 2. 重新启动mysql 服务器 service mysqld restart 3.进入mysql平台 设置需要同步的用户账号 create user '用户名'@'从服务器ip地址' identified by '密码' create user 'eduask'@'10.0.0.66' identified by 'test123' #创建一个从服务器用户同步到主服务器 4. 给slave 用户赋权限 grant all on *.* to 'eduask'@'10.0.0.%' identified by 'test123' grant replication slave on *.* to 'eduask'@'10.0.0.66' identified by 'test123' 允许从服务器用户远程登录 5.刷新授权表 flush privileges 6.给数据库创建测试数据库 create table userinfo( uid int primary key auto_increment, uname char(30) not null, upwd char(30) not null ); insert into userinfo (`uid`,`uname`,`upwd`) values(null,'aaa','test123') 7.退出系统 /q exit ------------从服务器配置完成后再操作----------- 8. 导出主服务器数据库 传递到从服务器 /usr/local/web/mysql/bin/mysqldump -uroot -ptest123 数据库名 > /home/数据库名.sql scp 从哪里 到哪里 scp /home/数据库名.sql root@10.0.0.66:/home [提示: 如果系统提示你是否远程传输 yes] 系统会提示你输入密码: test123 9.重新启动主服务器 service mysqld stop service mysqld start 10. 进入mysql 平台 /usr/local/web/mysql/bin/mysql -uroot -ptest123 11.查询主服务器状体 master show master status; 运行后mysql 会显示一个当前master 的服务器日志状况表,我们需要记住两个字段的值 file: mysql-bin.000006 #这是需要同步的master 的二进制文件 position:519-----------------------------------------------------------------------------------------------------------------------配置从服务器 (在 10.0.0.66) 1.进入mysql 平台 /usr/local/web/mysql/bin/mysql -uroot -ptest123 2.创建数据库 create database mydemo; eixt 3.导入master 的数据库 /usr/local/web/mysql/bin/mysql -uroot -ptest123 数据库名 < /home/数据库名.sql 4.配置从服务器mysql 配置文件 vi /etc/my.cnf 找到 server-id=1 改成 2 (注意:server-id 必须要比master 的大 关键是不能重复) 在 [mysqld] 后面添加 replicate-do-db=mydemo #配置需要同步的数据库名 保存文件 :wq 5.重启mysqld service mysqld restart 6.以root用户登录mysql 平台 /usr/local/web/mysql/bin/mysql -uroot -ptest123 stop slave; change master to master_host='10.0.0.12', #master ip master_user='eduask', #master 用户名 master_password='test123', #master 密码 master_port=3306, #master 端口 master_log_file='mysql-bin.000006', #master 需要同步的二进制 master_log_pos=519, #master pos master_connect_retry=60; #连接master 的时间 7.启动slave start slave; 8. 查看是否连接同步成功 show slave status/G; 如果 SLAVE_IO_running yes slave_sql_running yes 这两个参数都为 yes 则表示成功 否则失败----------------------------------------------------------------------------------------------------------------------测试主从数据库同步 1.进入主服务器 /usr/local/web/mysql/bin/mysql -uroot -ptest123 use mydemo; insert into userinfo(uid,uname,upwd) values(nuull,'111','222'); 2. 进入从服务器 /usr/local/web/mysql/bin/mysql -uroot -ptest123 use mydemo; select * from userinfo; 如果从服务器中有master 的数据 成功
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InnoDBBufferPool reduces disk I/O by caching data and indexing pages, improving database performance. Its working principle includes: 1. Data reading: Read data from BufferPool; 2. Data writing: After modifying the data, write to BufferPool and refresh it to disk regularly; 3. Cache management: Use the LRU algorithm to manage cache pages; 4. Reading mechanism: Load adjacent data pages in advance. By sizing the BufferPool and using multiple instances, database performance can be optimized.

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SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA


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