def sdb
        @sdb ||= AwsSdb::Service.new(
                                     :logger => Logger.new(STDERR), # Add this line to prevent aws_sdb to writing log file
                                     :access_key_id => @uri[:access_key_id],
                                     :secret_access_key => @uri[:secret_access_key]
                                     )
        @sdb
      end