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

docs/ref/models/querysets.txt

+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



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