'Delete every subject from the database.'

def _Wipeout(self, subjects):

    self.test_name = 'wipeout'
    for i in subjects:
        subject = subjects[i]['name']
        predicates = subjects[i]['attrs']
        number_predicates = len(predicates)
        count_values = 0
        for j in predicates:
            count_values += len(predicates[j])
        data_store.DB.DeleteSubject(subject, token=self.token)
        self.predicates -= number_predicates
        self.values -= count_values
        self.subjects -= 1
        self.Register()
    subjects = {}
    data_store.DB.Flush()
