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Free MongoDB C100DEV Questions

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MongoDB Certified Developer Associate Exam Sample Questions (Q175-Q180):

NEW QUESTION # 175
Which of the following commands are valid to start a mongod?

A. mongod --logpath /var/log/mongo/mongod.log --dbpath /data/db --fork
B. mongod --dbpath /data/db --fork
C. mongod -f /etc/mongod.conf
D. mongod --log /var/log/mongo/mongod.log --db /data/db --fork

Answer: A,C

Explanation:
mongod --dbpath /data/db --fork This is incorrect because a --logpath must be specified in order to fork the process. mongod --log /var/log/mongo/mongod.log --db /data/db --fork This is incorrect because both --log and --db are invalid flags.

NEW QUESTION # 176
Why is high cardinality important when choosing a shard key?

A. Because documents with the same shard key will be placed in the same chunk. This can result in a very big chunk.
B. It's not important. Low cardinality is just as good as high cardinality.

Answer: A

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

NEW QUESTION # 177
We have a movies collection with the following document structure: { _id: ObjectId("573a1390f29313caabcd60e4"), title: 'The Immigrant', released: ISODate("1917-06-17T00:00:00.000Z"), rated: 'UNRATED', year: 1917, imdb: { rating: 7.8, votes: 4680, id: 8133 } } We need to filter those movies where the imdb rating is greater then 7. Which query should we use?

A. db.movies.find( { "imdb.rating": { "$gt": 7 } } )
B. db.movies.find( { imdb.rating: { "$gt": 7 } } )
C. db.movies.find( { "imdb.rating": { "$gte": 7 } } )

Answer: A

Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.find/

NEW QUESTION # 178
What is data modeling in MongoDB world?

A. A way to show your database with graphs.
B. A way to decide whether to store your data in the cloud or locally.
C. A way to build your application based on how your data is stored.
D. A way to organize fields in a document to support your application performance and querying capabilities.

Answer: D

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

NEW QUESTION # 179
Select all true statements about query plans in MongoDB. (select 2)

A. For a given query, each index in the collection generates at least one query plan.
B. If there are no indexes for the query, the main stage in the query plan will be the COLLSCAN stage.
C. Query plans are cached so that plans don't have to be generated and compared with each other each time a query is executed.

Answer: B,C

Explanation:
https://docs.mongodb.com/manual/core/query-plans/

NEW QUESTION # 180
......

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