mysql 查询表占多大空间

SELECT TABLE_NAME FROM information_schema.`TABLES` T where TABLE_SCHEMA='tidemedia_vms' order by DATA_LENGTH desc;

use information_schema;

查询数据库“tidemedia_cms”中publish_task 的表
select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB')as datafrom TABLESwhere table_schema='tidemedia_cms' and table_name='publish_task';

select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB')as datafrom TABLESwhere table_schema='uchome' and table_name='uchome _log';

1、进去指定schema 数据库（存放了其他的数据库的信息）

1	mysql>use information_schema;

2	Database changed

2、查询所有数据的大小

1	mysql> select concat(round( sum (DATA_LENGTH/1024/1024), 2), 'MB' )

2	-> as data from TABLES;

3	+ -----------+

4

| data|

5	+ -----------+

6	| 6674.48MB |

7	+ -----------+

8	1 row in set (16.81 sec)

3、查看指定数据库实例的大小，比如说数据库 forexpert

1	mysql> select concat(round( sum (DATA_LENGTH/1024/1024), 2), 'MB' )

2	-> as data from TABLES where table_schema= 'forexpert' ;

3	+ -----------+

4

| data|

5	+ -----------+

6	| 6542.30MB |

7	+ -----------+

8	1 row in set (7.47 sec)

4、查看指定数据库的表的大小，比如说数据库 forexpert 中的 member 表

view sourceprint?

1	mysql> select concat(round( sum (DATA_LENGTH/1024/1024),2), 'MB' ) as data

2	-> from TABLES where table_schema= 'forexpert'

3	-> and table_name= 'member' ;

4	+ --------+

5

| data |

6	+ --------+

7	| 2.52MB |

8	+ --------+

9	1 row in set (1.88 sec)