Doubts on One-To-One Field

def userProfile(models.Model):

      user=models.OneToOneField(User,primary_key=True)

       """

       Other stuff

       """

I can query it like this 

x = userProfile.objects.get(user__id=1)(Assuming this exists)

when I do a connection.queries a single query is executed.When I try to access the username i.e x.user.username a new query is executed again when I see connection.queries? Is this the expected behavior. Wouldn't this be bad if we have huge databases? I have a scenario where some classes have common information and then they have different fields based on their classes. I have tested this OneToOneField by the above example and for some reason reluctant to use this because of the new query? The other approach would be abstract base classes where information stored in the db would be duplicated but the additional query can be saved I think any thoughts?

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