Nov-2023 Free MongoDB C100DEV Exam Question Practice Exams [Q148-Q163]

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Nov-2023 Free MongoDB C100DEV Exam Question Practice Exams

Ace C100DEV Certification with 253 Actual Questions

MongoDB C100DEV Certification Exam is an excellent opportunity for developers to validate their skills and knowledge in MongoDB. MongoDB Certified Developer Associate Exam certification exam is comprehensive, up-to-date, and recognized by the industry. Developers who pass the exam can showcase their expertise in MongoDB and open doors to new career opportunities.

How to become a MongoDB Certified Developer Associate

The MongoDB Certified Developer Associate certification is the first step to becoming a MongoDB developer.

To become certified, you need to pass one exam that tests your knowledge of the MongoDB query language, database administration, and application development.

The exam is available in English

You can take the exam at any Pearson VUE testing center around the world.

NEW QUESTION 148
Which of the following queries can use an index on the title field?

db.movies.find( { _id: 245 } )

db.movies.find()

db.movies.find( { title: “Death Note” } )

db.movies.find( { genres: “Drama”, type: “series” } )

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

NEW QUESTION 149
Select all true statements regarding to replica sets in MongoDB.

We can have up to 50 replica set members, but only 7 of those will be voting members.

Replica set members have a fixed role assigned.

Replica sets use failover to provide high availability to client applications.

Replica set members have a fixed role assigned. -> False The availability of the system will be ensured by failing over the role of primary to an available secondary node through an election. https://docs.mongodb.com/manual/replication/

NEW QUESTION 150
Suppose you are connected to mongod instance that is already running on port 27000 as admin user. You have to dump reviews collection from the restaurants database to BSON file. Which command should you use?

mongodump –db restaurants –collection reviews

mongodump –db reviews –collection restaurants

mongoexport –db restaurants –collection reviews

https://docs.mongodb.com/database-tools/mongodump/

NEW QUESTION 151
Select all true statements about reconfiguring a replica set with rs.reconfig().

When we reconfigure a replica set with rs.reconfig(), we don’t need to restart any of the individual nodes.

When we reconfigure a replica set with rs.reconfig(), we need to update all of the nodes’ configuration files.

https://docs.mongodb.com/manual/reference/method/rs.reconfig/

NEW QUESTION 152
Given the following example document from an artists collection: { _id: 5, last_name: ‘Maurer’, first_name: ‘Alfred’, year_born: 1868, year_died: 1932, nationality: ‘USA’ } and the following index: db.artists.createIndex( { “last_name”: 1, “nationality”: 1 } ) How MongoDB will handle the query below?
db.artists.find( { “last_name”: /^O./ } )

None of these.

As an index scan.

MongoDB will need to do a collection scan.

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

NEW QUESTION 153
How to display MongoDB configuration file from command line?

$ cat /var/mongod.conf

$ cat /etc/mongod.conf

$ cat /home/mongod.conf

$ cat /bin/mongod.conf

https://docs.mongodb.com/manual/reference/configuration-options/#use-the-configuration-file

NEW QUESTION 154
Suppose you want to familiarize with a new collection and want to display a single document. Which collection method should you use in this case?

db.collection.getOne()

db.collection.findOne()

db.collection.find()

db.collection.explain()

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

NEW QUESTION 155
Select all true statements regarding to the role of fields and values in a MongoDB document. (select 2)

A field is a unique identifier for a specific data point.

You can have duplicate field names within the same level of a single document.

Values don’t need to be attached to fields and can be standalone data points.

Each field has a value associated with it.

https://docs.mongodb.com/manual/core/document/

NEW QUESTION 156
How to shutdown the server? (Mongo shell)

use admin

db.shutdown()

use admin

db.shutdownServer()

use admin

db.disconnect()

https://docs.mongodb.com/manual/reference/method/db.shutdownServer/

NEW QUESTION 157
There is a gamers collection in your database with the following document structure: { _id: 1, level: 15, is_active: true }, { _id: 2, level: 14, is_active: true }, { _id: 3, level: 7, is_active: false } How do you increase the value of the level field by 20 for a player with id = 3?
Expected result:
{ _id: 1, level: 15, is_active: true }, { _id: 2, level: 14, is_active: true }, { _id: 3, level: 27, is_active: false }

db.gamers.update( { _id: 3 }, { $inc: { level: 20 } } )

db.gamers.update( { _id: 3 }, { $set: { level: 20 } } )

db.gamers.update( { _id: 3 }, { $unset: { level: 20 } } )

https://docs.mongodb.com/manual/reference/operator/update/inc/

NEW QUESTION 158
How to connect to mongod instance and authenticate as root?

mongoroot –authenticationDatabase admin

mongo –username root –password root123 –authenticationDatabase admin

mongo –authenticationDatabase admin

https://docs.mongodb.com/v4.4/mongo/#mongodb-instance-with-authentication

NEW QUESTION 159
Why is MongoDB using BSON instead of JSON to store data? Select all that apply.

BSON format is not human readable (BSON is machine-readable only).

BSON supports more data types than JSON.

BSON contains metadata to describe a document/object.

BSON simply means ‘Binary JSON’.

https://www.mongodb.com/json-and-bson

NEW QUESTION 160
You have the following index in a products collection: { product_category: 1, product_name: 1, origin_country: -1 } Which of the following queries can use this index? Check all that apply.

db.products.find({ origin_country: ‘Bangladesh’, product_name: ‘AIR MAX 90’, product_category: ‘shoes’ })

db.products.find({ product_name: ‘AIR MAX 90’, product_category: ‘shoes’, origin_country: ‘Bangladesh’ })

db.products.find({ product_category: ‘shoes’, product_name: ‘AIR MAX 90’, origin_country: ‘Bangladesh’ })

db.products.find({ product_name: ‘AIR MAX 90’, origin_country: ‘Bangladesh’ })

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

NEW QUESTION 161
Suppose you have a companies collection in your database. Only the following documents are stored in this collection: { _id: ObjectId(“52cdef7c4bab8bd675297da4”), name: ‘Powerset’, category_code: ‘search’, founded_year: 2006 }, { _id: ObjectId(“52cdef7c4bab8bd675297da5”), name: ‘Technorati’, category_code: ‘advertising’, founded_year: 2002 }, { _id: ObjectId(“52cdef7c4bab8bd675297da7”), name: ‘AddThis’, category_code: ‘advertising’, founded_year: 2004 }, { _id: ObjectId(“52cdef7c4bab8bd675297da8”), name: ‘OpenX’, category_code: ‘advertising’, founded_year: 2008 }, { _id: ObjectId(“52cdef7c4bab8bd675297daa”), name: ‘Sparter’, category_code: ‘games_video’, founded_year: 2007 }, { _id: ObjectId(“52cdef7c4bab8bd675297dac”), name: ‘Veoh’, category_code: ‘games_video’, founded_year: 2004 }, { _id: ObjectId(“52cdef7c4bab8bd675297dae”), name: ‘Thoof’, category_code: ‘web’, founded_year: 2006 } What is the default sort order in the result set returned in response to the following query?

db.companies.aggregate( [ { “$sortByCount”: “$category_code” } ] )

ascending

descending

https://docs.mongodb.com/manual/reference/operator/aggregation/sortByCount/

NEW QUESTION 162
Select all options where you should use sharding.

Your server disks are full, but you can scale up.

You have over 6TB per server and operating costs are increasing dramatically.

Your organization outgrows the most powerful servers available, which limits your vertical scaling capabilities.

Every time you start a new project with MongoDB.

https://docs.mongodb.com/manual/sharding/

NEW QUESTION 163
Use case: e-learning platform Which of the following scenarios is the best candidate to use the Computed Pattern?

A course model needs to store a counter representing the number of times it was purchased.