查看mysql库大小，表大小，索引大小

查看所有库的大小

mysql> use information_schema;

Database changed

mysql> selectconcat(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> selectconcat(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)

 

查看指定库的指定表的大小

mysql> selectconcat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES where table_schema='jishi' andtable_name='a_ya';

+--------+

| data   |

+--------+

| 0.02MB |

+--------+

1 row in set (0.00 sec)

 

查看指定库的索引大小

mysql> SELECTCONCAT(ROUND(SUM(index_length)/(1024*1024), 2), ' MB') AS 'TotalIndex 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> SELECTCONCAT(ROUND(SUM(index_length)/(1024*1024), 2), ' MB') AS 'TotalIndex 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)

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

1 row in set (0.00 sec)

 

ERROR: 

No query specified

 

mysql> select count(*) from test.a_yuser;

+----------+

| count(*) |

+----------+

|  1073607 |

+----------+

1 row in set (0.00 sec)

 

mysql> 

查看一个库中的情况...

mysql>  SELECTCONCAT(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 ofRows | 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 |

+---------------+----------------+-----------+------------+---------+

4 rows in set (0.13 sec)