nameserver..

I need a nameserver tool that will 1. create a list of all the nameservers on the internet along with all the domains pointing to them and 2. store the data in a MongoDB database in a way that will not consume much memory because there are probably more than 2,000,000,000 domain names on the internet. Thus, the below database schema design is very important for the task.

HERE'S THE SAMPLE DATABASE SCHEMA DESIGN:

https://docs.google.com/document/d/1dPlmX7vLqPOyM9hH2mSVihp-Pi1axzKkYNSxuk1cQvU/edit?usp=sharing

Could you answer the question in the doc, please?