SQL语句查看mysql中每个数据库占用磁盘空间的大小

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;

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