linux mysql 查看数据库大小

SELECT 
CONCAT(TRUNCATE(SUM(data_length)/1024/1024,2),\'MB\') AS data_size, 
CONCAT(TRUNCATE(SUM(max_data_length)/1024/1024,2),\'MB\') AS max_data_size, 
CONCAT(TRUNCATE(SUM(data_free)/1024/1024,2),\'MB\') AS data_free, 
CONCAT(TRUNCATE(SUM(index_length)/1024/1024,2),\'MB\') AS index_size, 
TABLE_SCHEMA 
FROM information_schema.tables 
group by TABLE_SCHEMA;