Got a packet bigger than 'max_allowed_packet' bytes

导入sql时，一个批次大于 max_allowed_packet 时会报这个错，

查看：

show VARIABLES like '%max_allowed_packet%'

临时调大（比如20M）

set global max_allowed_packet = 20*1024*1024

https://blog.csdn.net/superit401/article/details/77480078