查询MySQL指定库或指定表的大小以及索引的大小

使用MySQL自带的information_schema数据库进行查询。 首先介绍一下information_schema数据库,这个数据库是MySQL自带的,数据库中保存了MySQL服务器所有数据库的信息,这里面有一个TABLES表,主要字段有: TABLE_SCHEMA : 数据库名 TABLE_NAME : 表明 ENGINE :存储引擎 TABLES_ROWS:记录数 DATA_LENGTH:数据大小 INDEX_LENGTH:索引大小 .....

查询表占用空间大小等于是查询数据+索引

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 |
+----------+
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          |
+------------------+
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         |
+------------------+
row in set (0.00 sec)
mysql> show create table test.a_yuser\G;
*************************** 1. row ***************************
       Table: a_yuser
Create Table: CREATE TABLE `a_yuser` (
  `email` varchar(60) NOT NULL DEFAULT '',
  `user_name` varchar(60) NOT NULL DEFAULT '',
  KEY `cc` (`email`(5)),
  KEY `ccb` (`user_name`(5)),
  KEY `ccbc` (`email`(5),`user_name`(5))
) ENGINE=MyISAM DEFAULT CHARSET=utf8
row in set (0.00 sec)
 
ERROR: 
No query specified
 
mysql> select count(*) from test.a_yuser;
+----------+
| count(*) |
+----------+
|  1073607 |
+----------+
row in set (0.00 sec)

查看一个库中的情况:

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 'test';
+---------------+----------------+-----------+------------+---------+
| Table Name    | Number of Rows | Data Size | Index Size | Total   |
+---------------+----------------+-----------+------------+---------+
| test.a_br     | 0.4625M        | 0.0259G   | 0.0171G    | 0.0431G |
| test.a_skuclr | 0.7099M        | 0.0660G   | 0.0259G    | 0.0919G |
| test.a_yuser  | 1.0736M        | 0.0497G   | 0.0213G    | 0.0710G |
| test.test     | 0.0000M        | 0.0000G   | 0.0000G    | 0.0000G |
+---------------+----------------+-----------+------------+---------+
rows in set (0.13 sec)

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