1.mysql -uroot -p 123456
2.show databases; 查看全部数据库
3.select database(); 查看当前数据库
4.show variables like 'port';
5. 查看当前数据库大小，如查看springdata库大小
select concat(round(sum(data_length)/(1024*1024),2) + round(sum(index_length)/(1024*1024),2),'MB') as 'DB Size'
-> from tables
-> where table_schema='springdata';
6. 查看数据所占有的空间
select concat(round(sum(data_length)/(1024*1024),2),'MB') as 'DB Size'
-> from tables
-> where table_schema='springdata';
7.查看索引所占用的空间
select concat(round(sum(index_length)/(1024*1024),2),'MB') as 'DB Size'
-> from tables
-> where table_schema='INVOICE';
8.查看数据库编码
show variables like 'character%';
9.status
10.show tables;
11. 查看权限
show grants for 'root'@'localhost';
12.某个人的权限
show grants for 'root'@'localhost';