一、查询所有数据库占用空间大小
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;
二、查询对应数据库表占用空间大小
1 SELECT TABLE_NAME, CONCAT( TRUNCATE(data_length / 1024 / 1024, 2), ‘ MB‘ ) AS data_size, CONCAT( TRUNCATE(index_length / 1024 / 1024, 2), ‘ MB‘ ) AS index_size FROM information_schema.tables WHERE TABLE_SCHEMA = ‘数据库名字‘ GROUP BY TABLE_NAME ORDER BY data_length DESC;
三、查询某个数据库对应表占用空间大小
SELECT CONCAT( ROUND(SUM(DATA_LENGTH / 1024 / 1024), 2), ‘MB‘ ) AS DATA FROM TABLES WHERE table_schema = ‘数据库名字‘ AND table_name = ‘表名字‘;
原文：https://www.cnblogs.com/lcl-cn/p/14395350.html