This project contains INNER JOIN optimization for MySQL for Django
MIT License
This project contains optimizations (hacks) for MySQL for Django ORM.
It's based on Django 1.7 (master branch). It was started on PyCon 2014 Development Sprint.
We are going to test possible regressions that might appear in real projects. This backend passes all Django tests, but we still have to test it in real projects.
There are two very simple ways to catch INNER JOIN bug:
list_display
in your Django Admin model;In these cases even if you limit query by 1 it will join whole tables, order them and only after that it will slice it to limit. Thus if you have i.e. 400k records in two tables it would take 3+ seconds to get small slice. STRAIGHT_JOIN forces MySQL work as we expect: order -> slice -> join.
Specify django-mysql-fix backend in your DATABASES setting in Django settings.py::
DATABASES = {
'default': {
'ENGINE': 'django_mysql_fix.backends.mysql',
...
},
}
Tested with Django master branch and Django 1.6.0+.
It doesn't work with Django <= 1.5.x.
For now there is only one optimization there.