進入information_schema 資料庫（存放了其他的資料庫的資訊）
use information_schema;
檢視所有庫的大小
mysql> use information_schema;
database changed
mysql> select concat(round(sum(data_length/1024/1024),2),'mb') as data
from tables;
+----------+
| data |
+----------+
| 104.21mb |
+----------+
1 row in set (0.11 sec)
檢視指定庫的大小
mysql> select concat(round(sum(data_length/1024/1024),2),'mb') as data
from tables where table_schema='jishi';
+---------+
| data |
+---------+
| 26.17mb |
+---------+
1 row in set (0.01 sec)
檢視指定庫的指定表的大小
mysql> select concat(round(sum(data_length/1024/1024),2),'mb') as data
from tables wheretable_schema='jishi' and table_name='a_ya';
+--------+
| data
|+--------+
| 0.02mb |
+--------+
1 row in set (0.00 sec)
檢視指定庫的索引大小
mysql> select concat(round(sum(index_length)/(1024*1024), 2), ' mb') as 'total index size' from tables
where table_schema = 'jishi';
+------------------+
| total index size |
+------------------+
| 0.94 mb |
+------------------+
1 row in set (0.01 sec)
檢視指定庫的指定表的索引大小
mysql> select concat(round(sum(index_length)/(1024*1024), 2), ' mb') as 'total index size' from tables
where table_schema = 'test' and table_name='a_yuser';
+------------------+
| total index size |
+------------------+
| 21.84 mb
|+------------------+
1 row in set (0.00 sec)
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