Which projection shows only the FirstName and lastName fields of a document in the customers collection?

Documents in mongodb are atomic at the ___ level

What should the priority of a member be in order to prevent it from becoming the primary in replica set?

You need to add an index to the large name collection in your production database. You do not want to have disruption of service for your users and you can't afford to have a team to do the work during after hours. What should you do?

When using aggregation $convert. which is not a parameter?

All tag values in tag sets must be _.

To perform a search on a collection, and obtain a cursor object for the results, use:

MongoDB stores documents in structures called

TSV files should be expected to contain:

MongoDB's query language uses operators that start with which character?

The binary log of transactions used to recover the database after a crash is called the: