Optimization request - give ``request.session`` lazy read

[Yo-Yo Ma]

With ``contrib.sessions`` installed and ``SessionMiddleware`` in use, I noticed that when Django session cookie is set the ``django_session`` table is queried on every request, regardless of whether any session data is used during the request cycle. Making the ``session`` attribute of request a lazy object would represent an optimization in the following 2 cases, both of which are the same, in effect:

1) User logs in to perform login-required tasks, then visits pages that don't require login
2) User logs in to perform login-required tasks, logs out, then visits pages that don't require login

Would this sort of change be backward-incompatible?

[jdetaeye]

If the query is a problem for you that requires optimization, you're
probably better off using cookie-based sessions.

[Aymeric Augustin]

2012/10/2 jdetaeye <johan.d...@gmail.com>

If the query is a problem for you that requires optimization, you're
probably better off using cookie-based sessions.

Either that, or the cache backend.

Sessions are the easiest thing to move out of the database when you have scaling problems.

--
Aymeric.