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Diffstat (limited to 'docs')
| -rwxr-xr-x | docs/topics/migrations.txt | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/docs/topics/migrations.txt b/docs/topics/migrations.txt index 1321d5908d..dd5f5e7d1f 100755 --- a/docs/topics/migrations.txt +++ b/docs/topics/migrations.txt @@ -418,6 +418,13 @@ need to do is use the historical model and iterate over the rows:: Once that's done, we can just run ``python manage.py migrate`` as normal and the data migration will run in place alongside other migrations. +.. note:: + + Be careful when running a migration with :setting:`DEBUG=True <DEBUG>` as + Django :ref:`saves all SQL queries <faq-see-raw-sql-queries>` that are run + which may result in large memory usage. This issue is addressed in + Django 1.8 where only 9000 queries are saved. + You can pass a second callable to :class:`~django.db.migrations.operations.RunPython` to run whatever logic you want executed when migrating backwards. If this callable is omitted, migrating |