medium_django_db_optimization_delete_update.py

# Don't.Delete one by one.
for entry in Entry.objects.all():
    entry.delete()
    
# Do.Delete all at once.
Entry.objects.all().delete()

# Don't
for entry in Entry.objects.all():
    entry.likes += 1
    entry.save()
    
# Do
Entry.objects.update(likes=F('likes')+1)