# File lib/aws/rds/db_instance_collection.rb, line 51
      def _each_item marker, max_records, options = {}, &block

        options[:marker] = marker if marker
        options[:max_records] = [[20,max_records].max,100].min if max_records

        response = client.describe_db_instances(options)
        response.data[:db_instances].each do |details|

          db_instance = DBInstance.new_from(
              :describe_db_instances,
              details,
              details[:db_instance_identifier],
              :config => config)

          yield(db_instance)

        end

        response.data[:marker]

      end