[support] Drupal site breaks with MySQL collation-server option

Hi everyone. This is doesn't have to be significative, but I've noticed that my Drupal 7.15 test site reset every connection attempt if I put this directive in my.cnf (MySQL config file): collation-server=utf8_spanish_ci Reverting the change of course brings back Drupal to its normal behavior, but I wonder the reason of that situation. Any ideas?? This is solely for learning purposes not for production settings ;) Many thanks in advance!