“MySQL server has gone away” with Ruby on Rails

Question

After our Ruby on Rails application has run for a while, it starts throwing 500s with \"MySQL server has gone away\". Often this happens overnight. It\'s started doing this

Answer 1

I had this problem when sending really large statements to MySQL. MySQL limits the size of statements and will close the connection if you go over the limit.

set global max_allowed_packet = 1048576; # 2^20 bytes (1 MB) was enough in my case