def _MakeSignature(app_id=None,
                   url=None,
                   kind=None,
                   db_filename=None,
                   perform_map=None,
                   download=None,
                   has_header=None,
                   result_db_filename=None,
                   dump=None,
                   restore=None):
  """Returns a string that identifies the important options for the database."""

  if download:
    result_db_line = 'result_db: %s' % result_db_filename
  else:
    result_db_line = ''
  return u"""
  app_id: %s
  url: %s
  kind: %s
  download: %s
  map: %s
  dump: %s
  restore: %s
  progress_db: %s
  has_header: %s
  %s
  """ % (app_id, url, kind, download, perform_map, dump, restore, db_filename,
         has_header, result_db_line)