MySQL Community Server 官网：https://dev.mysql.com/downloads/mysql
基础架构及系统版本：x86_64，CentOS Linux release 7.9.2009 （Core）
yum包路径：/var/cache/yum/x86_64/7/base/packages
mariadb的库：mariadb-libs
rpm -ivh：install verbose（冗长） hash（哈希） ——可视化。
查看mysql服务状态及本次开启:systemctl status mysqld，systemctl start mysqld
刷新密码：FLUSH PRIVILEGES
privileges 刷新特权，改变俱乐部的钥匙的分配
1.清除本机mysql和mariadb
2.下载RPM Bundle并解压
3.顺序安装：
mysql-community-common-8.3.0-1.el7.x86_64.rpm
mysql-community-client-plugins-8.3.0-1.el7.x86_64.rpm
mysql-community-libs-8.3.0-1.el7.x86_64.rpm
mysql-community-client-8.3.0-1.el7.x86_64.rpm
mysql-community-icu-data-files-8.3.0-1.el7.x86_64.rpm
mysql-community-server-8.3.0-1.el7.x86_64.rpm
4.启动mysql服务
6.登录mysql，mysql -u root -p
5.查看密码，cat /var/log/mysqld.log | grep password
7.修改密码，ALTER USER 'root'@'localhost' IDENTIFIED mysql_native_password BY 'Root?2?'