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[1.4.X] Fixed #13869 - Warned that QuerySet.iterator() doesn't affect DB driver caching; thanks jtiai for the suggestion.

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Backport of 2f722d9728 from master
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Tim Graham 2012-10-20 15:21:19 -04:00
parent 13bbe9161d
commit 6c1c490f64
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docs/ref/models/querysets.txt
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@ -1451,6 +1451,16 @@ evaluated will force it to evaluate again, repeating the query.
Also, use of ``iterator()`` causes previous ``prefetch_related()`` calls to be Also, use of ``iterator()`` causes previous ``prefetch_related()`` calls to be
ignored since these two optimizations do not make sense together. 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
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