MySQL: How to get database sizes

MySQL provides metadata of the database itself, basically just run this on your query. Don't forget to replace database name with yourown database name.

SELECT
  TABLE_NAME AS `Table`,
  ROUND((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024) AS `Size (MB)`
FROM
  information_schema.TABLES
WHERE
  TABLE_SCHEMA = "replace_with_your_database_name"
ORDER BY
  (DATA_LENGTH + INDEX_LENGTH)
DESC;

Credit, thanks to: https://chartio.com/resources/tutorials/how-to-get-the-size-of-a-table-in-mysql/