Get a list databases and their size in MB.
SELECT
table_schema AS 'Db Name',
Round(Sum(data_length + index_length) / 1024 / 1024, 3) AS 'Db Size (MB)',
Round(Sum(data_free) / 1024 / 1024, 3) AS 'Free Space (MB)'
FROM
information_schema. TABLES
GROUP BY
table_schema;