How to make Django QuerySet bulk delete() more efficient

For those who are still looking for an efficient way to bulk delete in django, here's a possible solution:

The reason delete() may be so slow is twofold: 1) Django has to ensure cascade deleting functions properly, thus looking for foreign key references to your models; 2) Django has to handle pre and post-save signals for your models.

If you know your models don't have cascade deleting or signals to be handled, you can accelerate this process by resorting to the private API _raw_delete as follows:

queryset._raw_delete(queryset.db)

More details in here. Please note that Django already tries to make a good handling of these events, though using the raw delete is, in many situations, much more efficient.

Not without writing your own custom SQL or managers or something; they are apparently working on it though.

http://code.djangoproject.com/ticket/9519

Bulk delete is already part of django

Keep in mind that this will, whenever possible, be executed purely in SQL