Rappel de commande Utile mySQL:

SELECT
  table_schema AS NomBaseDeDonnees, 
  ROUND(SUM( data_length + index_length ) / 1024 / 1024, 2) AS BaseDonneesMo 
FROM information_schema.TABLES
GROUP BY TABLE_SCHEMA;

SELECT 
 TABLE_NAME,
 CONCAT(ROUND(((DATA_LENGTH + INDEX_LENGTH - DATA_FREE) / 1024 / 1024), 2), 'Mo') AS TailleMo 
FROM information_schema.TABLES 
WHERE TABLE_SCHEMA = 'nom_base_de_donnees'