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[1.4.X] Added documentation notes about lack of database savepoints s…

…upport when using MySQL+MyISAM.

Refs #15507 and r17341.

Backport of r17923.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.4.X@17924 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit 839a71b0a586b1c274546ac3ed8e599be8db10b9 1 parent 1433051
Ramiro Morales ramiro authored
Showing with 17 additions and 0 deletions.
  1. +17 −0 docs/ref/databases.txt
17 docs/ref/databases.txt
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@@ -148,6 +148,8 @@ procedures, but Django currently doesn't use stored procedures.
.. _MySQL 4.1: http://dev.mysql.com/doc/refman/4.1/en/index.html
.. _MySQL 5.0: http://dev.mysql.com/doc/refman/5.0/en/index.html
+.. _mysql-storage-engines:
+
Storage engines
---------------
@@ -360,6 +362,21 @@ via the :class:`~django.db.models.Options.db_table` parameter.
.. _known issues: http://bugs.mysql.com/bug.php?id=48875
+Savepoints
+----------
+
+Both the Django ORM and MySQL (when using the InnoDB :ref:`storage engine
+<mysql-storage-engines>`) support database :ref:`savepoints
+<topics-db-transactions-savepoints>`, but this feature wasn't available in
+Django until version 1.4 when such supports was added.
+
+If you use the MyISAM storage engine please be aware of the fact that you will
+receive database-generated errors if you try to use the :ref:`savepoint-related
+methods of the transactions API <topics-db-transactions-savepoints>`. The reason
+for this is that detecting the storage engine of a MySQL database/table is an
+expensive operation so it was decided it isn't worth to dynamically convert
+these methods in no-op's based in the results of such detection.
+
Notes on specific fields
------------------------
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