查询所有数据库占用磁盘空间大小的SQL语句：
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select concat(truncate(sum(data_length)/1024/1024,2),' MB') as data_size from information_schema.tables;
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查询单个库中所有表磁盘占用大小的SQL语句：
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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_size desc;
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以上语句测试有效，注意替换以上的TestDB为数据库名
