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MongoDB Certified Developer Associate Exam Sample Questions (Q178-Q183):

NEW QUESTION # 178
Data modeling. You are considering the use of nesting or references in your data model. Documents can grow rapidly. Which option would be more appropriate?

• A. Use of nesting.
• B. Use of reference.

Answer: B

Explanation:
https://docs.mongodb.com/manual/core/data-modeling-introduction/

NEW QUESTION # 179
Suppose you are connected to mongod instance that is already running on port 27000 as admin user. You have to export reviews collection from the restaurants database to JSON file named reviews.json. Which command should you use?

• A. mongoexport --db restaurants --collection reviews -o reviews.json
• B. mongoexport --db restaurants --collection reviews -o export.json
• C. mongodump --db restaurants --collection reviews -o reviews.json

Answer: A

Explanation:
https://docs.mongodb.com/database-tools/mongoexport/

NEW QUESTION # 180
Select true statements about the selection of the shard key.

• A. Non-monotonic data is a good choice for shard key.
• B. Monotonically changing shard keys result in write operations going to a single shard. This is inefficient.
• C. High cardinality provides more shard key values, which determines the maximum number of chunks the balancer can create.
• D. High frequency - most documents fall within a particular range. This can lead to bottleneck problems within the cluster.

Answer: A,B,C,D

Explanation:
https://docs.mongodb.com/manual/core/sharding-shard-key/

NEW QUESTION # 181
What do you mean by collection scan during query execution?

• A. It can use the index to limit the number of documents it must check.
• B. It scans every document in a collection, to select those documents that match the query.

Answer: B

Explanation:
https://docs.mongodb.com/manual/indexes/

NEW QUESTION # 182
We have a movies collection with the following document structure: { _id: ObjectId("573a1390f29313caabcd6223"), genres: [ 'Comedy', 'Drama', 'Family' ], title: 'The Poor Little Rich Girl', released: ISODate("1917-03-05T00:00:00.000Z"), year: 1917, imdb: { rating: 6.9, votes: 884, id: 8443 } } We need to extract all movies from this collection where genres includes both 'Crime' and 'Mystery'. Which query should we use?

• A. db.movies.find( { genres: { $nin: ["Crime", "Mystery"] } } )
• B. db.movies.find( { genres: { $in: ["Crime", "Mystery"] } } )
• C. db.movies.find( { genres: { $any: ["Crime", "Mystery"] } } )
• D. db.movies.find( { genres: { $all: ["Crime", "Mystery"] } } )

Answer: D

Explanation:
https://docs.mongodb.com/manual/reference/operator/query/all/

NEW QUESTION # 183
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