diff options
Diffstat (limited to 'docs/ref/models')
| -rw-r--r-- | docs/ref/models/querysets.txt | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt index 3090251659..5fe783514d 100644 --- a/docs/ref/models/querysets.txt +++ b/docs/ref/models/querysets.txt @@ -1981,15 +1981,15 @@ 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 still load the entire result set into memory, but +won't cache results after iterating over them. Oracle and :ref:`PostgreSQL +<postgresql-server-side-cursors>` use server-side cursors to stream results +from the database without loading the entire result set into memory. + +.. versionchanged:: 1.11 - 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`_. + PostgreSQL support for server-side cursors was added. -.. _server side cursors: http://initd.org/psycopg/docs/usage.html#server-side-cursors ``latest()`` ~~~~~~~~~~~~ |