https://www.cnblogs.com/DataArt/p/10173957.html

1 查询表大小

SELECT table_name AS "表名", 
round(((data_length + index_length) / 1024 / 1024), 2) AS "大小(MB)" 
FROM information_schema.tables 
WHERE table_schema = 'your_database_name' AND table_name = 'order';
 

2 设置

2.1 最大1G

SET GLOBAL max_allowed_packet=1024*1024*1024;;

2.2 或者，在 my.cnf（或 my.ini）配置文件中设置：

[mysqld]
max_allowed_packet=512M