I realized that I should add more information to this post. The scope is different for each request. In the list_all request I'm querying a gearman (gearman.org) database worker daemon which is a long running process that keeps the $dhb in memory. In the create request it is via a different method and a new $dbh which means it must have something do with the cache of the long running process. How can I refresh/reset the cache?