To manage a process on big queryset without overload the DB and the RAM, set the following loop:
STEP=1000
all_objects = MyObject.objects.order_by("id").all()
total = my_objects.count()
offset = 0
limit = STEP
while offset < total:
for my_object in my_objects[offset:limit]:
# … do what you need to do …
offset += STEP
limit += STEP
⚠️ you need to set a order_by to the queryset to ensure all records are browsed