Fixed #3711, #6734, #12581 -- Bounded connection.queries.

Prevented unlimited memory consumption when running background tasks
with DEBUG=True.

Thanks Rob, Alex, Baptiste, and others.

docs/faq/models.txt

@@ -32,6 +32,12 @@ same interface on each member of the ``connections`` dictionary::
     >>> from django.db import connections
     >>> connections['my_db_alias'].queries
 
+If you need to clear the query list manually at any point in your functions,
+just call ``reset_queries()``, like this::
+
+    from django.db import reset_queries
+    reset_queries()
+
 Can I use Django with a pre-existing database?
 ----------------------------------------------
 
@@ -76,22 +82,3 @@ type, create an initial data file and put something like this in it::
 As explained in the :ref:`SQL initial data file <initial-sql>` documentation,
 this SQL file can contain arbitrary SQL, so you can make any sorts of changes
 you need to make.
-
-Why is Django leaking memory?
------------------------------
-
-Django isn't known to leak memory. If you find your Django processes are
-allocating more and more memory, with no sign of releasing it, check to make
-sure your :setting:`DEBUG` setting is set to ``False``. If :setting:`DEBUG`
-is ``True``, then Django saves a copy of every SQL statement it has executed.
-
-(The queries are saved in ``django.db.connection.queries``. See
-:ref:`faq-see-raw-sql-queries`.)
-
-To fix the problem, set :setting:`DEBUG` to ``False``.
-
-If you need to clear the query list manually at any point in your functions,
-just call ``reset_queries()``, like this::
-
-    from django import db
-    db.reset_queries()

docs/releases/1.8.txt

@@ -170,7 +170,8 @@ Management Commands
 Models
 ^^^^^^
 
-* ...
+* Django now logs at most 9000 queries in ``connections.queries``, in order
+  to prevent excessive memory usage in long-running processes in debug mode.
 
 Signals
 ^^^^^^^
@@ -263,6 +264,8 @@ Now, an error will be raised to prevent data loss::
 Miscellaneous
 ~~~~~~~~~~~~~
 
+* ``connections.queries`` is now a read-only attribute.
+
 * ``URLField.to_python`` no longer adds a trailing slash to pathless URLs.
 
 * ``django.contrib.gis`` dropped support for GEOS 3.1 and GDAL 1.6.