# File lib/rds/rds.rb, line 113
        def describe_db_instances(options={})
            params = {}
            params['DBInstanceIdentifier'] = options[:db_instance_identifier] if options[:db_instance_identifier]
            params['MaxRecords'] = options[:max_records] if options[:max_records]
            params['Marker'] = options[:marker] if options[:marker]

            resp = do_request("DescribeDBInstances", params, :pull_out_array=>[:describe_db_instances_result, :db_instances])

        rescue Exception
            on_exception
        end