mysql 查看表大小的方法实践

1.查看所有数据库容量大小

select
table_schema as '数据库',
sum(table_rows) as '记录数',
sum(truncate(data_length/1024/1024, 2)) as '数据容量(MB)',
sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)'
from information_schema.tables
group by table_schema
order by sum(data_length) desc, sumjavascript(index_length) descphp;

2.查看所有数据库各表容量大小

select
table_schema as '数据库',
table_name as '表名',
table_rows as '记录数',
truncate(data_length/1024/1024, 2) as '数据容量(MB)',
truncate(index_length/1024/1024, 2) as '索引容量(MB)'
from information_schema.tables
order by data_length desc, index_length desc;

3.查看指定数据库容量大小

例：查看mysql库容量大小：代码如下：

select
table_schema as '数据库',
sum(table_rows) as '记录数',
sum(truncate(data_length/1024/1024, 2)) as '数据容量(MB)',
sum(truncate(index_length/1024/1024, 2)) as '索引容量(MB)'
from information_schema.tables
where table_schema='mysql';

4.查看指定数据库各表容量大小*

例：查看mysql库各表容量大小

select
table_schema as '数据库',
table_name as '表名',
table_rows as '记录数',
truncate(data_length/1024/1024, 2) as '数据容量(MB)',
truncate(index_length/1024/1www.devze.com024, 2) as '索引容量(MB)'
from information_schema.tables
wh编程客栈ere tabl编程e_schema='mysql'
order by data_length desc, index_length desc;

PS：查看MySql数据空间使用情况：

information_schema是MySQL的系统数据库，information_schema里的tables表存放了整个数据库各个表的使用情况。

可以使用sql来统计出数据库的空间使用情况，相关字段：

• table_schema：数据库名
• table_name：表名
• table_rows：记录数
• data_length：数据大小
• index_length：索引大小

使用空间

1、统计表使用空间

select concat(round(sum(data_length/1024/1024),2),'mb') as data from tables where table_schema='mydb' and table_name='mytable';

| data |

| 0.02mb |

1 row in set (0.00 sec)

2、统计数据库使用空间

select conca开发者_Redist(round(sum(data_length/1024/1024),2),'MB') as data from tables where table_schema='mydb';

| data |

| 6.64MB |

1 row in set (0.00 sec)

3、统计所有数据使用空间

select concat(round(sum(data_length/1024/1024),2),'MB') as data from tables;

| data |

| 6.64MB |

1 row in set (0.01 sec)

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