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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 data_length desc;
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 = ‘TestDB‘ group by TABLE_NAME order by data_length desc;
注意替换以上的TestDB为具体的数据库名
MySQL中查询所有数据库占用磁盘空间大小和单个库中所有表的大小的sql语句
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原文地址：http://www.cnblogs.com/hust-chenming/p/4285534.html
