RPM安装MySQL 5.7
-----------------------版本1 centos7-----------------------
1.卸载mariadb.lib
2.顺序：common、lib、client、server(/var/log/mysqld.log密码)
3.chown -R mysql:mysql /data/mydata ;
mysqld [--user=mysql] --datadir=/data/mydata --initialize
(mysqld --verbose --help 含有各种变量和选项)
4.vi /etc/my.cnf
5.systemctl start mysqld.service
6.mysql_secure_installation --user=root --password='dfsfsdfs'
版本2 centos6-------------------------
1.卸载其他版本的mysql，必要时用rpm -e MySQL-*** --nodeps
2.顺序：common、lib、client、server（/root/.mysql_secret or /var/log/mysqld.log）
3.chown -R mysql:mysql /data/mysqldata
mysqld --user=mysql --datadir=/data/mysqldata --initialize
4.vi /etc/my.cnf
5.chkconfig --add mysqld chkconfig mysqld --level 35 on
6.mysql_secure_installation --user=root --password=
----密码安全认证插件-------------
1.show plugins;
2.在my.cnf的mysqld中添加validate_password=off
3.重启mysqld
-------------------密码---------------------
set password for 'root'@localhost = PASSWORD('chenxing');
-------------------mysql系统日志时间晚于系统8个小时的问题---------------
将log_timestamps=SYSTEM即可
-------------------其他操作---------------------
1.授权：GRANT SELECT,UPDATE,INSERT,DELETE on *.* to yongfu_a@'localhost';
取消授权：REVOKE SELECT,UPDATE,INSERT,DELETE on *.* from yongfu_a@'localhost';
2.删除一个用户：drop user 'root'@'localhost';
3.添加用户：create user 'root'@"localhost' identified by 'cxx';
4.设置密码：set password for 'root'@'localhost' = PASSWORD("cxx");
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