# File lib/fog/aws/models/rds/server.rb, line 62
        def modify(immediately, options)
          options[:security_group_names] ||= options['DBSecurityGroups']
          params = self.class.new(options).attributes_to_params
          data = connection.modify_db_instance(id, immediately, params)
          merge_attributes(data.body['ModifyDBInstanceResult']['DBInstance'])
          true
        end