Mysql查看库、表占用文件大小

1、查看数据库所占用空间

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
FROM information_schema.tables WHERE TABLE_SCHEMA = '数据库名';

2、查看表所占空间

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
FROM information_schema.tables WHERE TABLE_NAME = '表名';

3.查询数据库指定库的表大小，按大小排序

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'
GROUP BY TABLE_NAME
ORDER BY data_length DESC;