mysql查询数据库表、索引大小排序

说明：

通过MySQL的 information_schema 数据库，可查询数据库中每个表占用的空间、表记录的行数；该库中有一个 TABLES 表，这个表主要字段分别是：

TABLE_SCHEMA : 数据库名
TABLE_NAME：表名
ENGINE：所使用的存储引擎
TABLES_ROWS：记录数
DATA_LENGTH：数据大小
INDEX_LENGTH：索引大小

其他字段请参考MySQL的手册，查看一个表占用空间的大小，那就相当于是 数据大小 + 索引大小 。

 

查看所有库的大小

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)

 

查看指定库的大小

mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data  from TABLES where table_schema='jishi';
+---------+
| data    |
+---------+
| 26.17MB |
+---------+
row in set (0.01 sec)

查看指定库的指定表的大小

mysql> select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data  from TABLES where table_schema='jishi' and table_name='a_ya';
+--------+
| data   |
+--------+
| 0.02MB |
+--------+
row in set (0.00 sec)

查看指定库的索引大小

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)

查看指定库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)

查看一个库中的情况并排序

mysql> SELECT CONCAT(table_schema,'.',table_name) AS 'Table Name', CONCAT(ROUND(table_rows/1000000,4),'M') AS 'Number of Rows', CONCAT(ROUND(data_length/(1024*1024*1024),4),'G') AS 'Data Size',CONCAT(ROUND(index_length/(1024*1024*1024),4),'G') AS 'Index Size', CONCAT(ROUND((data_length+index_length)/(1024*1024*1024),4),'G') AS'Total'FROM information_schema.TABLES WHERE table_schema LIKE 'my'  ORDER BY --total DESC;
+--------------------------------------------+----------------+-----------+------------+---------+
| Table Name                          | Number of Rows | Data Size | Index Size | Total   |
+--------------------------------------------+----------------+-----------+------------+---------+
| my.log_task                         | 10.4727M       | 0.7378G   | 0.8315G    | 1.5693G |
| my.log_goods_produce                | 14.8695M       | 0.6396G   | 0.7509G    | 1.3906G |
| my.log_gift                         | 6.8921M        | 0.5483G   | 0.5450G    | 1.0933G |
| my.log_goods_drop                   | 5.2306M        | 0.4267G   | 0.4167G    | 0.8433G |
| my.log_goods_consume                | 8.1588M        | 0.4179G   | 0.4127G    | 0.8306G |
| my.log_gameplay                     | 9.4614M        | 0.3177G   | 0.3963G    | 0.7139G |
| my.log_dungeon                      | 4.7170M        | 0.2962G   | 0.3401G    | 0.6363G |
| my.log_gold_weapon_canyu            | 7.3790M        | 0.2796G   | 0.3298G    | 0.6093G |

参考网址：

http://www.oschina.net/question/12_3673

http://blog.sina.com.cn/s/blog_4c197d420101fbl9.html