查询所有数据库占用磁盘空间大小的SQL语句：

    复制代码代码如下:

    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：

    复制代码代码如下:

    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;

    以上语句测试有效，注意替换以上的TestDB为数据库名