Free C100DEV Mock Exam – Practice Online Confidently

You are a MongoDB Associate Developer and need to demonstrate how to load the Atlas Sample Dataset into your MongoDB Atlas cluster. Your manager has asked you to guide a junior developer through this process to ensure they can independently load the dataset. What steps should the junior developer follow to successfully load the Atlas Sample Dataset?

You have two collections in your MongoDB database: students and grades. The students collection contains the following document:{    "_id": ObjectId("64d5b0e5c9d95a76ac3ebed2"),    "student_id": 1,    "name": "Alice"}The grades collection contains the following documents:{    "_id": ObjectId("64d5b0e5c9d95a76ac3ebed3"),    "student_id": 2,    "course": "Math",    "grade": "A"},{    "_id": ObjectId("64d5b0e5c9d95a76ac3ebed4"),    "student_id": 2,    "course": "Science",    "grade": "B"}You run the following aggregation query to retrieve students along with their grades:db.students.aggregate([    {        $lookup: {            from: "grades",            localField: "student_id",            foreignField: "student_id",            as: "grades_details"        }    }])What will be the structure of the documents returned by this aggregation query for the student with student_id: 1?

Which of the following is the best practice for managing MongoDB data growth in a production environment (scale-out)?

In your database there is a collection named trips with the following document structure:{  '_id': ObjectId("572bb8222b288919b68abf6d"),  'trip_duration': 858,  'start_station id': 532,  'end_station_id': 401,  'bike_id': 17057,  'start_station_loc': { type: 'Point', coordinates: [ -73.960876, 40.710451 ] },  'end_station_loc': { type: 'Point', coordinates: [ -73.98997825, 40.72019576 ] },  'start_time': ISODate("2016-01-01T00:09:31.000Z"),  'stop_time': ISODate("2016-01-01T00:23:49.000Z")}How can you extract all trips from this collection ended at stations that are to the west of the -73.5 longitude coordinate?

As a MongoDB Developer, you are tasked with the deletion of specific documents in a collection named users. The documents to be deleted are those that meet the following criteria: the age field is less than 18 and the status field is "inactive". After the deletion, you need to know the count of the deleted documents. Which of the following commands would correctly perform this operation?