def check_constraints(self, table_names=None):
        self.cursor().execute('SET CONSTRAINTS ALL IMMEDIATE')
        self.cursor().execute('SET CONSTRAINTS ALL DEFERRED')
Test that the runChdirSafe is actually safe, i.e., it still
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/db/backends/oracle/base.py/DatabaseWrapper.check_constraints--crossover with--dataset/ETHPy150Open twisted/twisted/twisted/python/test/test_release.py/UtilityTests.test_chdir