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_sizefrom information_schema.tablesgroup by TABLE_SCHEMAorder 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_sizefrom information_schema.tables where TABLE_SCHEMA = 'TestDB'group by TABLE_NAMEorder by data_length desc;
注意替换以上的TestDB为具体的数据库名