mysql访问异常，提示设置max_allowed_packet

Question

com.mysql.jdbc.PacketTooBigException: Packet for query is too large (1168 > 1024). You can change this value on the server by setting the max_allowed_packet' variable.

max_allowed_packet已经为16m修改且生效，但是还是报这个异常。重启后恢复正常，
运行一段时间会再次出现，请求

Answer 1

是不是数据库插入，或者query太耗资源了，造成mysql资源不够