MySQL查看数据库中所有表占用的空间大小

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 = '数据库名称' 
group by TABLE_NAME 
order by data_length desc;