# File lib/AWS/RDS/rds.rb, line 194
194:       def describe_db_instances( options = {} )
195:         params = {}
196:         params['DBInstanceIdentifier'] = options[:db_instance_identifier] if options.has?(:db_instance_identifier)
197:         params['MaxRecords'] = options[:max_records].to_s if options.has?(:max_records)
198:         params['Marker'] = options[:marker] if options.has?(:marker)
199: 
200:         return response_generator(:action => "DescribeDBInstances", :params => params)
201:       end