verify_active_connections!

# File activerecord/lib/active_record/connection_adapters/abstract/connection_specification.rb, line 114
      def verify_active_connections! #:nodoc:
        if @@allow_concurrency
          remove_stale_cached_threads!(@@active_connections) do |name, conn|
            conn.disconnect!
          end
        end
        
        active_connections.each_value do |connection|
          connection.verify!(@@verification_timeout)
        end
      end