查看MySQL数据库大小

1.首先进入information_schema 数据库（存放了其他的数据库的信息）

mysql> use information_schema;Database changed

2.查看大小
（1）查看所有数据库大小

mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES;

结果：

（2）查看指定数据库大小

mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES where table_schema='CarData';

结果

（3）查看指定数据库的指定表单的大小

mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES where table_schema='CarData' and table_name='driver020294';

结果

查看指定数据库指定表单的其他大小：

mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data_size,    -> concat(round(sum(MAX_DATA_LENGTH/1024/1024),2),'MB') as max_data_size,    -> concat(round(sum(INDEX_LENGTH/1024/1024),2),'MB') as index_size,    -> concat(round(sum(DATA_FREE/1024/1024),2),'MB') as data_free    -> from TABLES where table_schema='CarData' and table_name='driver020294';

结果：

注：第一步也可以不用使用数据库，直接像下面这样写;

mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data_size,    -> concat(round(sum(MAX_DATA_LENGTH/1024/1024),2),'MB') as max_data_size,    -> concat(round(sum(INDEX_LENGTH/1024/1024),2),'MB') as index_size,    -> concat(round(sum(DATA_FREE/1024/1024),2),'MB') as data_free    -> from INFORMATION_SCHEMA.TABLES where table_schema='CarData' and table_name='driver020294';

结果是一样的：