http://blog.csdn.net/light_language/article/details/70567962

关于查数据库和表中的数据和索引所占空间的大小的SQL方法:

查询information_schema架构中的tables表。

代码:

查询所有数据库占用磁盘空间大小的SQL语句:

select table_schema,concat(truncate(sum(data_length)/1024/1024,2),‘MB’) as data_size,

concat(truncate(sum(index_length)/1024/1024,2),‘MB’) as index_size

from information_schema.tables

group by table_schema

order by sum(data_length) desc;

这里写图片描述

查询单个库中所有表磁盘占用大小的SQL语句:

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='employees’

order by data_length desc;