1、常见命令
1.1、查看所有账户信息
select host,user from mysql.user;
select distinct concat('User: ''',user,'''@''',host,''';') as query from mysql.user;
1.2、修改账户密码
use mysql;
UPDATE user SET authentication_string=PASSWORD('Root123!') WHERE user='root';
1.3、创建账户
create user 'deployusr'@'localhost' identified by 'Deploy123!';
create user 'deployusr'@'%' identified by 'Deploy123!';
1.4、给库赋予权限
use deploy；
grant all privileges on deploy to 'deployusr'@'localhost';
grant select,insert,update,delete,create,drop on deploy.* to 'deployusr'@'localhost';
grant all privileges on deploy.* to 'deployusr'@'%';
1.5、对表赋予权限
grant select,insert,update,delete,create,drop on deploy.table1 to 'deployusr'@'%';
1.6、普通用户想要导出数据库中的表需要赋予file权限
首先赋予其他权限
grant select,insert,update,delete,create,drop on deploy.* to 'deployusr'@'%';
然后赋予file权限
grant file on *.* to deployusr@'%';
flush privileges;
默认只能导出到/var/lib/mysql-files目录，导入其他目录会报错
1.7、查看用户权限
show grants for deployusr;
show grants for 'deployusr'@'%';
1.8、撤销权限
revoke all on deploy from 'deployusr'@'localhost';
flush privileges;
1.9、删除用户和库
delete from user where user='deployusr' and host='localhost';
或者
drop user 'deployusr'@'localhost';
flush privileges;
drop database deploy;
1.10、备份数据库
mysqldump -u root -h host -p deploy > backup_deploy.sql
1.11、备份表
mysqldump -u root -h host -p deploy table1, table2 > backup_deploy_table.sql
1.12、批量执行插入等操作
把命令写入.sql的文件中
登录数据库
进入相应表
source .sql
1.13、查看表空间
select TABLE_NAME, concat(truncate(data_length/1024/1024,2),'MB') as data_size,
concat(truncate(index_length/1024/1024,2),'MB') as index_size
from information_schema.tables where TABLE_SCHEMA = 'missing_cust'
group by TABLE_NAME
order by data_length desc;
2、跳过密码登录
vi /etc/my.cnf
skip-grant-tables
3、最大超时时间设置
参考：
https://www.cnblogs.com/ivictor/p/5979731.html
4、锁表问题
参考：
https://www.iteye.com/blog/johnny-lee-2434634
5、truncate
参考：
https://blog.csdn.net/qq_37871669/article/details/98647541