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| author | Tim Graham <timograham@gmail.com> | 2012-10-20 15:21:19 -0400 |
|---|---|---|
| committer | Tim Graham <timograham@gmail.com> | 2012-10-20 15:22:34 -0400 |
| commit | 2f722d9728c1946d5d800b3e0b24de7f566a755d (patch) | |
| tree | 1a5343ef19c8735e10c6e03e40b04100581642cf | |
| parent | 4b27813198ae31892f1159d437e492f7745761a0 (diff) | |
Fixed #13869 - Warned that QuerySet.iterator() doesn't affect DB driver caching; thanks jtiai for the suggestion.
| -rw-r--r-- | docs/ref/models/querysets.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt index 858371978a..7138cd0e74 100644 --- a/docs/ref/models/querysets.txt +++ b/docs/ref/models/querysets.txt @@ -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 ~~~~~~ |