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Download MongoDB Certified Developer Associate Exam Exam Dumps

NEW QUESTION 38
What is a document in MongoDB?

• A. It's an ordered collection of keys (fields) with assigned values. The keys in each document are strings of characters. Documents in MongoDB cannot contain duplicate keys.
• B. It's a text file containing the configuration of the MongoDB instance.
• C. It's a table that contains information about all collections in the database.

Answer: A

NEW QUESTION 39
What is the built-in database called admin in MongoDB for?

• A. The admin database plays an important role in the authentication and authorization process. Certain actions performed by administrators also require access to this database.
• B. The admin database stores data describing the MongoDB server. For replica sets, it also stores information about the replication process.
• C. The admin database is used to store information about shards in shared MongoDB cluster.

Answer: A

Explanation:
https://docs.mongodb.com/manual/tutorial/manage-users-and-roles/

NEW QUESTION 40
Use case: e-learning platform Which of the following scenarios is the best candidate to use the Computed Pattern?

• A. A course model needs to store references to image of the course that are kept in an external location outside the database.
• B. A course model needs to store a counter representing the number of times it was purchased.
• C. Our app needs to retrieve a course and its ten most recent reviews.
• D. Our app needs to retrieve a course and information about its instructor.

Answer: B

Explanation:
https://www.mongodb.com/blog/post/building-with-patterns-the-computed-pattern

NEW QUESTION 41
Which of the following stages do you need to use to randomly select 10 documents from a specific collection?

• A. { $sample: { get: 10 } }
• B. { $sampleRate: { size: 10 } }
• C. { $rand: { size: 10 } }
• D. { $sample: { size: 10 } }

Answer: D

Explanation:
https://docs.mongodb.com/manual/reference/operator/aggregation/sample/

NEW QUESTION 42
Complete the sentence below.

• A. By default, all MongoDB user-created collections...
• B. have an _id index.
• C. have an field_id index.
• D. have no index.

Answer: B

Explanation:
https://docs.mongodb.com/manual/core/document/
https://docs.mongodb.com/manual/reference/method/ObjectId/

NEW QUESTION 43
......