#32711: MySQL performance regression in forms.models.apply_limit_choices_to_to_formfield ------------------------------------+-------------------------------------- Reporter: Thomas Achtemichuk | Owner: nobody Type: Uncategorized | Status: closed Component: Forms | Version: 3.2 Severity: Normal | Resolution: worksforme Keywords: | Triage Stage: Unreviewed Has patch: 0 | Needs documentation: 0 Needs tests: 0 | Patch needs improvement: 0 Easy pickings: 0 | UI/UX: 0 ------------------------------------+--------------------------------------
Comment (by Thomas Achtemichuk): Thanks for following up Mariusz & Simon. I agree that this smacks of typically poor MySQL subquery optimization, which is one of the reasons we're planning on migrating to PostgreSQL in the near future. In the meantime, I've monkeypatched in the `apply_limit_choices_to_to_formfield` from 3.1 which is doing the trick for us. And as 5.7 is quickly approaching EOL, probably not worth any more time/attention to the issue we're seeing. Simon, we're on MySQL 5.7.25, so a few minor versions back from the current GA release of 5.7.34 (or 5.7.33, available on RDS). Swapping the order of the condition doesn't seem to have any effect. -- Ticket URL: <https://code.djangoproject.com/ticket/32711#comment:3> Django <https://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/065.b38d54d88d55ecd3acb1a1bf956de659%40djangoproject.com.