统计MySQL数据库硬盘占用量大小

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 = '数据库名'
order by data_length desc;