active_record_runtime

# File actionpack/lib/action_controller/benchmarking.rb, line 86
      def active_record_runtime(runtime)
        db_runtime    = ActiveRecord::Base.connection.reset_runtime
        db_runtime    += @db_rt_before_render if @db_rt_before_render
        db_runtime    += @db_rt_after_render if @db_rt_after_render
        db_percentage = db_runtime * 100 / runtime
        " | DB: %.5f (%d%%)" % [db_runtime, db_percentage.to_i]
      end