Free Access MongoDB.C100DEV.v2025-04-24.q83 Practice Test (Page 14)

Question 61

What is the best practice in using the $match operator?

A.The later in the pipeline, the better.

B.The earlier in the pipeline, the better. Not only because we will be using expression filters which reduce the number of documents to be processed, but also because we can use indexes.

C.It doesn't matter when we apply $match stage.

Question 62

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 use Aggregation Framework to fetch all movies from this collection where 'Drama' is not in genres list and the minimum 'imdb.votes' is at least 100. Additionally, in the projection stage, we want to leave only the following fields: -> title -> genres -> imdb.votes We also want to sort the result set by decreasing imdb votes and limit the number of documents retuned to 5. Example output: [ { imdb: { votes: 1294646 }, genres: [ 'Action', 'Mystery', 'Sci-Fi' ], title: 'Inception' }, { imdb: { votes: 1109724 }, genres: [ 'Adventure', 'Fantasy' ], title: 'The Lord of the Rings: The Fellowship of the Ring' }, { imdb: { votes: 1081144 }, genres: [ 'Adventure', 'Fantasy' ], title: 'The Lord of the Rings: The Return of the King' }, { imdb: { votes: 1080566 }, genres: [ 'Action', 'Sci-Fi' ], title: 'The Matrix' }, { imdb: { votes: 1004805 }, genres: [ 'Action', 'Thriller' ], title: 'The Dark Knight Rises' } ] Which pipeline should you use?

A.[{ $match: { genres: { $nin: ['Drama'] }, 'imdb.votes': { $gte: 100 } } }, { $project: { _id: 0, title: 1, genres: 1, 'imdb.votes': 1 } }, { $sort: { 'imdb.votes': -1 } }, { $limit: 5 }]

B.[{ $match: { genres: { $in: ['Drama'] }, 'imdb.votes': { $gte: 100 } } }, { $project: { _id: 0, title: 1, genres: 1, 'imdb.votes': 1 } }, { $sort: { 'imdb.votes': -1 } }, { $limit: 5 }]

C.[{ $match: { genres: { $nin: ['Drama'] }, 'imdb.votes': { $gte: 100 } } }, { $project: { _id: 0, title: 1, genres: 1, 'imdb.votes': 1 } }, { $sort: { 'imdb.votes': -1 } }]

Question 63

You have a configuration file for mongod instance called mongod.conf in your working directory. How can you launch mongod instance with this configuration file?

A.mongod --conf mongod.conf

B.mongod --use mongod.conf

C.mongod --config mongod.conf

D.mongod -f mongod.conf

Question 64

You have to launch a replica set with three members. For the first node you have the following mongo1.conf configuration file: storage: dbPath: /var/mongodb/db/1 net: bindIp: localhost port: 27000 security: authorization: enabled systemLog: destination: file path: /var/mongodb/logs/mongod1.log logAppend: true processManagement: fork: true Update this configuration file so that this mongod instance: -> authenticates internally using the keyfile /var/mongodb/pki/keyfile -> belongs to the replica set repl-set-1 Which of the following configuration file should you choose?

A.storage:
dbPath: /var/mongodb/db/1
fork: true
replication:
replSetName: repl-set-1

B.storage:
dbPath: /var/mongodb/db/1
net:
bindIp: localhost
port: 27000
security:
authorization: enabled

C.systemLog:
destination: file
path: /var/mongodb/logs/mongod1.log
logAppend: true
processManagement:
fork: true
repl:
replSetName: repl-set-1

Question 65

Which of the following commands will successfully insert exactly two new documents into an empty companies collection?

A.db.companies.insertMany([ {"_id": 1, "name": "Facebook"}, {"_id": 1, "name": "Twitter"}, {"_id": 2, "name": "Tesla"} ], {"ordered": false})

B.db.companies.insertMany([ {"_id": 1, "name": "Facebook"}, {"_id": 1, "name": "Twitter"}, {"_id": 2, "name": "Tesla"} ])

C.db.companies.insertMany([ {"_id": 1, "name": "Facebook"}, {"_id": 2, "name": "Twitter"} ])

D.db.companies.insertMany([ {"_id": 1, "name": "Facebook"}, {"_id": 2, "name": "Twitter"}, {"_id": 2, "name": "Tesla"} ])

E.db.companies.insertMany([ {"name": "Facebook"}, {"name": "Twitter"} ])

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Question 61

Question 62

Question 63

Question 64

Question 65

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