def _create(self, create_policy=False, trace=True):
     self._db = substage.SubstagesInfo(self.stage)
     self._db.create_dbs(trace)
 def _open(self, append=False, trace=True, create_policy=False):
     self._db = substage.SubstagesInfo(self.stage)
     self._db.open_dbs(trace)