Get Prepared for Your C100DEV Exam With Actual 253 Questions [Q86-Q101]

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Get Prepared for Your C100DEV Exam With Actual 253 Questions

Valid C100DEV Test Answers Full-length Practice Certification Exams

MongoDB Certified Developer Associate Exam is an online exam that can be taken from anywhere in the world. C100DEV exam consists of multiple-choice questions that test the candidate’s knowledge of MongoDB. C100DEV exam is designed to be challenging and requires candidates to have a deep understanding of MongoDB. Candidates are given two hours to complete the exam, and a passing score of 75% is required to obtain the certification.

NO.86 What is the built-in database called config in MongoDB for?

The config database is used to store information about shards in shared MongoDB cluster.

The config database plays an important role in the authentication and authorization process. Certain actions performed by administrators also require access to this database.

The config database stores data describing the MongoDB server. For replica sets, it also stores information about the replication process.

https://docs.mongodb.com/manual/reference/config-database/

NO.87 What is a document in MongoDB?

It’s an ordered collection of keys (fields) with assigned values. The keys in each document are strings of characters. Documents in MongoDB cannot contain duplicate keys.

It’s a text file containing the configuration of the MongoDB instance.

It’s a table that contains information about all collections in the database.

NO.88 How to create a new user with the root role named root_user with password root123?

use admin db.createUser({ user: “root_user”, pwd: “root123”, roles: [“dbAdmin”] })

use admin db.createUser({ user: “root_user”, pwd: “root123”, roles: [“root”] })

use admin db.createUser({ user: “root_user”, pwd: “root123”, roles: [“clusterAdmin”] })

use admin db.createUser({ user: “root_user”, pwd: “root123”, roles: [“dbAdminAnyDatabase”] })

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

NO.89 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?

mongoexport –db restaurants –collection reviews -o reviews.json

mongodump –db restaurants –collection reviews -o reviews.json

mongoexport –db restaurants –collection reviews -o export.json

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

NO.90 Which of the following commands will add a collection that is stored in BSON file to a MongoDB cluster?

mongodump

mongorestore

mongoimport

mongoexport

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

NO.91 Use case: e-learning platform Which of the following scenarios is the best candidate to use the Subset Pattern?

Our app needs to retrieve a course and its ten most recent reviews.

Our app needs to retrieve a course and information about its instructor.

A course model needs to store references to image of the course that are kept in an external location outside the database.

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

https://www.mongodb.com/blog/post/building-with-patterns-the-subset-pattern

NO.92 What does it command do in the mongo shell?

Iterates through the cursor results.

Terminates the current query execution.

it is not a mongo shell command.

Displays cluster statistics.

NO.93 Which of the following built-in roles provides the greatest cluster management access?

clusterManager

clusterMonitor

clusterAdmin

Explanation: https://docs.mongodb.com/manual/reference/built-in-roles/#mongodb-authrole-clusterAdmin

NO.94 We have a restaurants collection with the following document structure: { _id: ObjectId(“5eb3d668b31de5d588f42a7d”), address: { building: ‘605’, coord: [ -74.0060152, 40.7372653 ], street: ‘Hudson Street’, zipcode: ‘10014’ }, cuisine: ‘French’, grades: [ { date: ISODate(“2014-06-30T00:00:00.000Z”), grade: ‘A’, score: 10 }, { date: ISODate(“2013-05-20T00:00:00.000Z”), grade: ‘A’, score: 13 }, { date: ISODate(“2012-12-11T00:00:00.000Z”), grade: ‘A’, score: 9 } ], name: ‘La Ripaille Restaurant’ } We need to use Aggregation Framework to calculate the total number of restaurants for top 5 cuisine (sorted in descending order by the number of restaurants). Expected output: [ { _id: ‘American’, total_restaurants: 6183 }, { _id: ‘Chinese’, total_restaurants: 2418 }, { _id: ‘Cafao/Coffee/Tea’, total_restaurants: 1214 }, { _id: ‘Pizza’, total_restaurants: 1163 }, { _id: ‘Italian’, total_restaurants: 1069 } ] Which pipeline should you use?

[{ $group: { _id: “$cuisine”, total_restaurants: { $sum: 1 } } }, { $sort: { total_restaurants: -1 } }, { $limit: 5 }]

[{ $group: { _id: “$cuisine”, total_restaurants: { $sum: 1 } } }, { $sort: { total_restaurants: 1 } }, { $limit: 5 }]

[{ $group: { _id: “$cuisine”, total_restaurants: { $sum: 1 } } }, { $limit: 5 }, { $sort: { total_restaurants: -1 } }]

[{ $group: { _id: “cuisine”, total_restaurants: { $sum: 1 } } }, { $sort: { total_restaurants: -1 } }, { $limit: 5 }]

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

NO.95 You have the following query: db.gamers.find( { “level”: { “$gte” : 70 }, “map”: “Inferno” } ).sort( { “points”: 1, “group”: 1 } ) Which of the following indexes best supports this query? Keep in mind the equality, sort, range rule.

{ points: 1, group: 1, level: 1, map: 1 }

{ level: 1, map: 1, points: 1, group: 1 }

{ points: 1, group: 1, map: 1, level: 1 }

{ map: 1, points: 1, group: 1, level: 1 }

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

NO.96 Select all true statements about one-to-zillions relationships (a special case of the one-to-many relationship in MongoDB).

We need to be extremely careful when writing queries that retrieve data on the zillions side.

Representing this relationships with document embedding is not recommended.

This relationship is created to emphasize the fact that huge cardinalities can impact design choices.

https://docs.mongodb.com/manual/tutorial/model-embedded-one-to-many-relationships-between-documents/

NO.97 It’s very important to picking a good shard key. If we don’t choose a good shard key, then we won’t be able to see the benefits of horizontal scaling.

False

True

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

NO.98 Suppose you have an accounts collection with the following document structure: { _id: ObjectId(“61af47c6e29861661d063714”), account_id: 1010, type: ‘investment’, limit: 1000000 }, { _id: ObjectId(“61af47c6e29861661d063715”), account_id: 4336, type: ‘derivatives’, limit: 100000 }, { _id: ObjectId(“61af47c6e29861661d063716”), account_id: 4336, type: ‘commodity’, limit: 1000 } Which of the following documents would be modified by this update? db.accounts.updateMany( { “type”: “investment” }, { “$set”: { “limit”: 2000000 } } )

{ _id: ObjectId(“61af47c6e29861661d063715”), account_id: 4336, type: ‘derivatives’, limit: 100000 }

{ _id: ObjectId(“61b1bde1ceb6f770f56b0cd9”), account_id: 4915, type: ‘investment’, limit: 1000000 }

{ _id: ObjectId(“61af47c6e29861661d067825”), account_id: 7355, type: ‘commodity’, limit: 500000 }

{ _id: ObjectId(“61af47c6e29861661d063714”), account_id: 1010, type: ‘investment’, limit: 1000000 }

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

NO.99 Select all default configurations for mongod.

By default, mongod doesn’t enforce authentication.

By default, mongod is only bound to localhost (or 127.0.0.1).

The default port for mongod is 27017.

The default data directory for mongod is /data/db

https://docs.mongodb.com/manual/reference/configuration-options/

NO.100 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( { “year_born”: 1863 } )

None of these.

As a collection scan.

As an index scan.

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

NO.101 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/

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MongoDB C100DEV exam is a computer-based exam that consists of 60 multiple-choice questions that need to be answered within 90 minutes. The questions are designed to test the developer’s understanding of MongoDB concepts and their ability to apply them in real-world scenarios.

Accurate & Verified 2023 New C100DEV Answers As Experienced in the Actual Test!: https://www.dumpstorrent.com/C100DEV-exam-dumps-torrent.html

Get Prepared for Your C100DEV Exam With Actual 253 Questions [Q86-Q101]

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