查看mysql库和表的大小（空间）

use information_schema;

查询所有数据的大小：

select concat(round(sum(data_length/1024/1024),2),‘MB‘) as data from tables;

查看指定数据库的大小：

select concat(round(sum(data_length/1024/1024),2),‘MB‘) as data from tables where table_schema=‘DATABASENAME‘;

查看指定数据库的某个表的大小：

select concat(round(sum(data_length/1024/1024),2),‘MB‘) as data from tables where table_schema=‘DATABASENAME‘ and table_name=‘TABLENAME‘;