# File lib/rds/right_rds_interface.rb, line 435
    def describe_db_parameter_groups(*db_parameter_group_name, &block)
      items, params = AwsUtils::split_items_and_params(db_parameter_group_name)
      params['DBParameterGroupName'] = items.first unless items.blank?
      result = []
      incrementally_list_items('DescribeDBParameterGroups', DescribeDbParameterGroupsParser, params) do |response|
        result += response[:db_parameter_groups]
        block ? block.call(response) : true
      end
      result
    end