ERROR 2005(HY000) unkonw MySQL server host

Q：MySQL還原備份出錯 ERROR 2005(HY000) unkonw MySQL server host
A：新建數據庫utf8
mysql -u root -p --default-character-set=utf8
use test;
set names utf8;
source e:\123\123.sql;


調大了 connect_timeout 和 wait_timeout的值
show global variables like '%timeout';
set global INTERACTIVE_TIMEOUT=2880000;
set global WAIT_TIMEOUT=2880000;


SQL語句太大了,查看一下允許的最大包大小：
show global variables like 'max_allowed_packet'; 
value/1024/1024為現在大小，修改參數值為256M（1024*1024*256）
set global max_allowed_packet=1073741824;

參考鏈接
https://www.cnblogs.com/ivictor/p/5979731.html
https://blog.csdn.net/fdipzone/article/details/51974165

mysql升級5.6至5.7
參考鏈接
https://www.cnblogs.com/java-123/p/10624600.html