# File lib/AWS/RDS/rds.rb, line 246
246:       def describe_db_parameters( options = {} )
247:         raise ArgumentError, "No :db_parameter_group_name provided" if options.does_not_have?(:db_parameter_group_name)
248: 
249:         params = {}
250:         params['DBParameterGroupName'] = options[:db_parameter_group_name]
251:         params['Source'] = options[:source] if options.has?(:source)
252:         params['MaxRecords'] = options[:max_records].to_s if options.has?(:max_records)
253:         params['Marker'] = options[:marker] if options.has?(:marker)
254: 
255:         return response_generator(:action => "DescribeDBParameters", :params => params)
256:       end