Commit 2f722d97 authored by Tim Graham's avatar Tim Graham
Browse files

Fixed #13869 - Warned that QuerySet.iterator() doesn't affect DB driver...

Fixed #13869 - Warned that QuerySet.iterator() doesn't affect DB driver caching; thanks jtiai for the suggestion.
parent 4b278131
Loading
Loading
Loading
Loading
+10 −0
Original line number Diff line number Diff line
@@ -1456,6 +1456,16 @@ evaluated will force it to evaluate again, repeating the query.
Also, use of ``iterator()`` causes previous ``prefetch_related()`` calls to be
ignored since these two optimizations do not make sense together.

.. warning::

    Some Python database drivers like ``psycopg2`` perform caching if using
    client side cursors (instantiated with ``connection.cursor()`` and what
    Django's ORM uses). Using ``iterator()`` does not affect caching at the
    database driver level. To disable this caching, look at `server side
    cursors`_.

.. _server side cursors: http://initd.org/psycopg/docs/usage.html#server-side-cursors

latest
~~~~~~