修改 my.ini 加上 max_allowed_packet =67108864
67108864=64M
默认大小4194304  也就是4M
修改完成之后要重启mysql服务，如果通过命令行修改就不用重启mysql服务。
命令修改：
设置为500M
mysql> set global max_allowed_packet = 500*1024*1024;

查看mysql的max_allowed_packet大小,运行
show VARIABLES like '%max_allowed_packet%';

可能不会立即生效，可以关闭命令行重新打开

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