1：当前默认配置
mysql> show VARIABLES like ‘%max_allowed_packet%‘;
+--------------------------+------------+
| Variable_name | Value |
+--------------------------+------------+
| max_allowed_packet | 4194304 |
| slave_max_allowed_packet | 1073741824 |
+--------------------------+------------+
2 rows in set (0.00 sec)
2：修改配置文件
vi /etc/my.cnf
[mysqld] 下面增加下面配置：
max_allowed_packet=10M
3：重启mysql
service mysqld restart
再次查看修改后的配置
mysql> show VARIABLES like ‘%max_allowed_packet%‘;
+--------------------------+------------+
| Variable_name | Value |
+--------------------------+------------+
| max_allowed_packet | 10485760 |
| slave_max_allowed_packet | 1073741824 |
+--------------------------+------------+
2 rows in set (0.00 sec)
mysql max_allowed_packet 设置过小导致记录写入失败
原文：https://www.cnblogs.com/fanjingfeng/p/12162534.html