On Thu, Dec 29, 2011 at 11:23 PM, rubix Rubix <aggouni2002 / yahoo.fr> wrote: > Hi, > > I am using ruby-mysql gem 2.9.4 in a multithreaded application: > I have three threads trying to access db and get information from the > same table but I am getting sql exception with message: > invalid packet: sequence number mismatch(53 != 6(expected)) > > Is there anything to do to solve this problem Wild guess: you are using the same connection for all threads. Solution: create a connection for each thread. Jesus.