查看mysql中database占用磁盘空间的大小SQL语句

1.选择information_schema

use information_schema

2.查询所有database占用磁盘空间大小

select TABLE_SCHEMA, concat(truncate(sum(data_length)/1024/1024,2)," MB") as data_size,
concat(truncate(sum(index_length)/1024/1024,2),"MB") as index_size
from information_schema.tables
group by TABLE_SCHEMA
order by data_length desc;

3.查询单个database占用磁盘空间大小

select TABLE_NAME, concat(truncate(data_length/1024/1024,2)," MB") as data_size,
concat(truncate(index_length/1024/1024,2)," MB") as index_size
from information_schema.tables where TABLE_SCHEMA = "数据库名称"
group by TABLE_NAME
order by data_length desc;