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MongoDB Certified Developer Associate Exam Sample Questions (Q92-Q97):

NEW QUESTION # 92
Consider a one-to-one relationship observed between users and the users details. Basic information about application users is separated from detailed information. Which of the following are true about modeling this one-to-one relationship with the document model in MongoDB?

• A. We can embed fields with detailed information as a subdocument in the users collection.
• B. We can link to a single document with detailed information in another collection.
• C. We can embed fields with detailed information in the users collection.

Answer: A,B,C Explanation:
https://docs.mongodb.com/manual/tutorial/model-embedded-one-to-one-relationships-between-documents/
NEW QUESTION # 93
Which of the following documents are valid JSON format? (select 2)

• A. ["_id": 1, "name": "Riviera Caterer", "cuisine": "American"]
• B. {"_id": 1, "address": {"street": "Stillwell Avenue", "zipcode": "11224"}}
• C. <"_id": 1, "name": "Riviera Caterer", "cuisine": "American">
• D. {_id: 1, name: "Riviera Caterer", cuisine: "American"}
• E. {"_id": 1, "name": "Riviera Caterer", "cuisine": "American"}

Answer: B,E Explanation:
While some software may not throw an error, this is still not valid JSON because each field name should be in quotes: {id: 1, name: "Riviera Caterer", cuisine: "American"} Square brackets instead of curly ones: ["id": 1, "name": "Riviera Caterer", "cuisine": "American"] The rest of the examples are self-evident. https://www.mongodb.com/json-and-bson
NEW QUESTION # 94
How can we represent a one-to-one relationship in MongoDB?

• A. We can embed fields as a child document in the document.
• B. We can link to a single document in another collection.
• C. We can embed fields in the document.

Answer: A,B,C Explanation:
https://docs.mongodb.com/manual/tutorial/model-embedded-one-to-one-relationships-between-documen ts/
NEW QUESTION # 95
Given the following example document from an artists collection: { id: 5, lastname: 'Maurer', firstname: 'Alfred', yearborn: 1868, yeardied: 1932, nationality: 'USA' } and the following index: db.artists.createIndex( { "lastname": 1, "nationality": 1 } ) How MongoDB will handle the query below?
db.artists.find( { "year_born": 1863 } )

• A. As an index scan.
• B. None of these.
• C. As a collection scan.

Answer: C Explanation:
https://docs.mongodb.com/manual/indexes/
NEW QUESTION # 96
We have the following index in a movies collection: { title: 1, genres: 1 } We want to insert the following document: { "title": "The Immigrant", "year": 1917, "genres": [ "Short", "Comedy", "Drama" ] } Select proper index entries.

• A. "Comedy", "The Immigrant"
• B. "Short", "The Immigrant"
• C. "Drama", "The Immigrant"
• D. "The Immigrant", "Short"
• E. "The Immigrant", "Short", "Comedy", "Drama"
• F. "The Immigrant", "Comedy"
• G. "The Immigrant", "Drama"

Answer: G Explanation:
https://docs.mongodb.com/manual/indexes/
NEW QUESTION # 97
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