active_record_runtime

# File actionpack/lib/action_controller/benchmarking.rb, line 100
      def active_record_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: %.0f" % db_runtime
      end