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Download MongoDB Certified Developer Associate Exam Exam Dumps
NEW QUESTION 51
You are working in a team on a certain application in the gaming sector. Queries similar to the following are quite often executed by your application. db.gamers.find( { level: 10, is_active: true } ) How can you speed up the execution of similar queries? Choose the best option.
Answer: C
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.createIndex/
NEW QUESTION 52
Which of the following commands will add a collection that is stored in JSON file to a MongoDB cluster?
Answer: D
Explanation:
https://docs.mongodb.com/database-tools/mongoimport/
NEW QUESTION 53
A collection called players contains the following documents: [ { _id: 1, user: 'Tom', scores: [ 23, 56, 3, 52, 62 ], bonus: 5 }, { _id: 2, user: 'Jane', scores: [ 42, 50, 10 ], bonus: 3 } ] You want to add additional fields to each document: -> total_score (sum of the scores Array) -> avg_score (average score in scores Array) Expected output: [ { _id: 1, user: 'Tom', scores: [ 23, 56, 3, 52, 62 ], bonus: 5, total_score: 196, avg_score: 39.2 }, { _id: 2, user: 'Jane', scores: [ 42, 50, 10 ], bonus: 3, total_score: 102, avg_score: 34 } ] Which query do you need to use?
Answer: B
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.aggregate/
NEW QUESTION 54
Which of the following stages do you need to use to randomly select 10 documents from a specific collection?
Answer: D
Explanation:
https://docs.mongodb.com/manual/reference/operator/aggregation/sample/
NEW QUESTION 55
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