一.mysql:
show variables like max_connections
set GLOBAL max_connections=1000
show variables like max_allowed_packet
set global max_allowed_packet = 40M
参见 参见 http://t.zoukankan.com/liulaolaiu-p-11744272.html
二.springboot 数据源
标签：常用,set,个人,show,max,variables,配置,packet,connections From： https://www.cnblogs.com/trump2/p/17032185.html