MySql查询各数据库空间占用

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_length DESC;