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If you're looking for MongoDB Interview Questions and Answers for Experienced & Freshers, you are at right place. There are lot of opportunities from many reputed companies in the world. According to research MongoDB has a market share of about 4.5%. So, You still have opportunities to move ahead in your career in MongoDB . Mindmajix offers advanced MongoDB Interview Questions and Answers that helps you in cracking your interview & acquire your dream career. Q. What’s a good way to get a list of all unique tags? What’s the best way to keep track of unique tags for a collection of documents millions of items large? The normal way of doing tagging seems to be indexing multikeys. I will frequently need to get all the unique keys, though. I don’t have access to mongodb’s new “distinct” command, either, since my driver, erlmongo, doesn’t seem to implement it, yet. Even if your driver doesn’t implement distinct, you can implement it yourself. In JavaScript (sorry, I don’t k...