Ver tamaño de una base de datos de MariaDB / MySQL

SELECT table_schema «database», sum(data_length + index_length)/1024/1024 «size in MB» FROM information_schema.TABLES GROUP BY table_schema;
SELECT table_schema «database», sum(data_length + index_length)/1024/1024/1024 «size in GB» FROM information_schema.TABLES GROUP BY table_schema;