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 data_length desc;
mysql 查询各数据库的占用大小
原文：http://www.cnblogs.com/rayong/p/7269443.html
