code: private void configureNoDBFile(final String argv[], final String arg, final List<String> noDbDevices)
              throws DevFailed {
          if (!ArrayUtils.contains(argv, NODB)) {
              throw DevFailedUtils.newDevFailed(INIT_ERROR, getUsage());
          } else {
              final String name = arg.split("=")[1];
              final File file = new File(name);
              if (!file.exists() && !file.isFile()) {
                  throw DevFailedUtils.newDevFailed(INIT_ERROR, name + " does not exists or is not a file");
              }
              logger.warn("Tango Database is not used - with file {} ", file.getPath());
              DatabaseFactory.setDbFile(file, noDbDevices.toArray(new String[0]), lastClass);
          }
  
      }
docs: Configure {@link DatabaseFactory} without a tango db and a file for
  properties
  
  @param argv
  @param arg
  @param noDbDevices
  @throws DevFailed