Mysql数据库查看Database的大小的方法

最简单的方法为:

select concat(round(sum(data_length/1024/1024),2),'MB') as data from INFORMATION_SCHEMA.tables where table_schema='XXXXX2206';

另外发现备份恢复的大小也不一样了

备份恢复之前
+-----------+
| data      |
+-----------+
| 5789.34MB |
+-----------+
1 row in set (6.51 sec)

备份恢复之后

+-----------+
| data      |
+-----------+
| 4821.02MB |
+-----------+
1 row in set (16.20 sec)

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

use information_schema;

mysql> use information_schema
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

2、查询所有数据的大小：
select concat(round(sum(data_length/1024/1024),2),'MB') as data from information_schema.tables;

3、查看指定数据库的大小：
比如查看数据库home的大小
select concat(round(sum(data_length/1024/1024),2),'MB') as data from information_schema.tables where table_schema='database_name';

4、查看指定数据库的某个表的大小
比如查看数据库home中 members 表的大小
select concat(round(sum(data_length/1024/1024),2),'MB') as data from information_schema.tables where table_schema='database_name' and table_name='table_name';