统计MySQL数据库大小的方法

use information_schema;

方法1：
select concat(round(sum(data_length/1024/1024),2),'MB') as data from tables where table_schema='数据库名';

方法2：
select concat(round(sum(data_length/1024/1024),2)+round(sum(index_length/1024/1024),2),'MB') as data from tables where table_schema='数据库名';