Check the disk usage of MySQL database

see mysql Disk usage of each database

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_size desc;

View the disk usage of all databases of the database instance

select concat(truncate(sum(data_length)/1024/1024,2),' MB') as data_size from information_schema.tables;

Query the disk usage of the specified database

select concat(truncate(sum(data_length)/1024/1024,2),’ MB’) as data_size from information_schema.tables where table_schema=‘information_schema’;