flush privileges;
1.修改ROOT密码：
alter user 'root'@'localhost' identified by '123';
2.取消密码复杂要求：
set global validate_password_policy=0;
3.查看密码长度：
select @@validate_password_length;
4.查看mysql当前有哪些用户:
SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user;
4.1查看用户权限.
show grants from user;
5.锁表:
flush tables with read lock;
6.解表:
unlock tables;
7.查看锁表时间
show variables like '%timeout%';
8.创建用户方式:
grant all privileges on 库名.* to admin@'%' identified by '123456'; （授权库）
CREATE USER 'username'@'host' IDENTIFIED BY 'password'; （单创建用户）
9.创建主从账号(在主数据库创建)
GRANT REPLICATION SLAVE ON *.* TO 'repl'@'%' IDENTIFIED BY 'password';
9.1.主库查询当前master的bin-log
show matser status;
10.从库连接主库方式:
CHANGE MASTER TO
MASTER_HOST='主库IP',
MASTER_PORT=3306,
MASTER_USER='repl',
MASTER_PASSWORD='主库创建的密码',
MASTER_LOG_FILE='mysql-bin.000002',
MASTER_LOG_POS=154;
11.启用mysql账号远程连接
GRANT ALL PRIVILEGES ON *.* TO root@"%" IDENTIFIED BY "youpassword" WITH GRANT OPTION;
12.收回账号权限
revoke select on dbname.* from username;
revoke all privileges on dbname[.tbname] from username;
privileges包括：
alter：修改数据库的表
create：创建新的数据库或表
delete：删除表数据
drop：删除数据库/表
index：创建/删除索引
insert：添加表数据
select：查询表数据
update：更新表数据
all：允许任何操作
usage：只允许登录
13. 创建mysql库
create database mobile DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
14.删除用户
DROP USER 'username'@'host';
15.删除库:
drop database dbname;
本文转自 一招拜师 51CTO博客，原文链接:http://blog.51cto.com/sadoc/1965227
