while true do
      opts[:offset] = offset
      offset += opts[:limit]
      found = DnsCountTelemetry.find_restricted(:all,opts)
      break if (found.nil? or found.size < 1)
      @records += found.size
      found.each { |dct|
        (0..COLUMNS.size-1).each { |c|
          cur = dct[COLUMNS[c].keys[0]]
          next unless cur != pre[c]
          num = cur < pre[c] ? cur : cur - pre[c]
          pre[c] = cur
          month = dct.created_at.month.to_i
          wday = dct.created_at.wday.to_i
          hour = dct.created_at.hour.to_i
          @counts[:month][month][c] += num
          @counts[:wday][wday][c] += num
          @counts[:hour][hour][c] += num
          @counts[:column][c] += num
          @counts[:detail][month][wday][hour][c] += num
        }
      }
    end
    GC.start