mysql怎么查看数据库中表的大小

1、查询整个mysql数据库，整个库的大小；单位转换为MB。

select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data  from information_schema.TABLES

2、查询mysql数据库，某个库的大小；

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

from information_schema.TABLES

where table_schema = 'testdb'

3、查看库中某个表的大小；

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

from information_schema.TABLES

where table_schema = 'testdb'

 and table_name = 'test_a'

4、查看mysql库中，test开头的表，所有存储大小；

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

from information_schema.TABLES

where table_schema = 'testdb'

 and table_name like 'test%'

--1、查看表空间的名称及大小

select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size

from dba_tablespaces t, dba_data_files d

where t.tablespace_name = d.tablespace_name

group by t.tablespace_name

--2、查看表空间物理文件的名称及大小

select tablespace_name, file_id, file_name,

round(bytes/(1024*1024),0) total_space

from dba_data_files

order by tablespace_name

mysql>show databases

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

| Database |

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

| information_schema |

| hnmcc |

| hnmcc_ecp |

| hnmcc_push |

| hnmcc_sso |

| mysql |

| percona|

| performance_schema |

| test |

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

9 rows in set (0.00 sec)

// 使用mysql自带管理表information_schema.

mysql>use information_schema；

mysql>select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data from TABLES where table_schema='hnmcc' and table_name='l_log_20160102'

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

| data |

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

| 4803.00MB |

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

1 row in set (0.00 sec)

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