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, sum(index_length) desc;
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/1024/1024, 2) as '索引容量(MB)'
from information_schema.tables
where table_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 concat(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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