[UPDATED 2024] C100DEV dumps Free Test Engine Verified By Certified Experts
Realistic C100DEV Accurate & Verified Answers As Experienced in the Actual Test!
To prepare for the MongoDB C100DEV certification exam, candidates are advised to study the official MongoDB documentation, attend training courses, and practice developing applications using MongoDB. MongoDB also offers preparation resources, including study guides, practice exams, and a certification exam readiness course, to help candidates prepare for the exam.
NEW QUESTION # 129
Which collection method do you need to use to drop a specific collection?
- A. db.collection.remove()
- B. db.collection.dropCollection()
- C. db.collection.dropIndex()
- D. db.collection.drop()
Answer: D
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.drop/
NEW QUESTION # 130
Given a companies collection where each document has the following structure: { _id: ObjectId("52cdef7c4bab8bd675297efd"), name: 'ZoomInfo', homepage_url: 'http://www.zoominfo.com', blog_url: 'http://zoominfoblogger.wordpress.com/', twitter_username: 'ZoomInfo', founded_year: 2000, email_address: '' } Extract all companies from this collection that have the same Twitter username as the company name. Which query should you use?
- A. db.companies.find( { $expr: { $eq: ['$name', 'twitter_username'] } } )
- B. db.companies.find( { $expr: { $ne: ['$name', '$twitter_username'] } } )
- C. db.companies.find( { $expr: { $eq: ['$name', '$twitter_username'] } } )
- D. db.companies.find( { $expr: { $eq: ['name', 'twitter_username'] } } )
Answer: C
Explanation:
db.companies.find( { $expr: { $eq: ['$name', 'twitter_username'] } } ) You have to use $ sign to evaluate twitter_username field. db.companies.find( { $expr: { $eq: ['name', 'twitter_username'] } } ) You have to use $ sign to evaluate name and twitter_username fields. https://docs.mongodb.com/manual/reference/operator/query/expr/
NEW QUESTION # 131
Which of the following statements are true about the mongo shell? Check all that apply.
- A. Mongo shell allows us to interact with MongoDB instance without using GUI.
- B. The mongo shell doesn't return documents in sorted order by default.
- C. You can get a sorted set of documents by using the sort() method.
- D. Mongo shell is a fully functioning JavaScript interpreter (which means that we can create things like JavaScript variables and functions in mongo shell).
Answer: A,B,C,D
Explanation:
https://docs.mongodb.com/manual/reference/mongo-shell/
NEW QUESTION # 132
Given a movies collection where each document has the following structure: { _id: ObjectId('573a1390f29313caabcd60e4'), genres: [ 'Short', 'Comedy', 'Drama' ], title: 'The Immigrant', year: 1917, imdb: { rating: 7.8, votes: 4680, id: 8133 }, countries: [ 'USA' ] } Which of the following queries will find all movies that were made in 2000 or 2010?
- A. db.movies.find( { $or: [ { year: 2000 }, { year: 2010 } ] } )
- B. db.movies.find( { year: 2000, year: 2010 } )
- C. db.movies.find( { $and: [ { year: 2000 }, { year: 2010 } ] } )
- D. db.movies.find( { $in: [ { year: 2000 }, { year: 2010 } ] } )
Answer: A
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.find/ https://docs.mongodb.com/manual/reference/operator/query/or/
NEW QUESTION # 133
What is a MongoDB view?
- A. A MongoDB view is a queryable object whose contents are defined by an aggregation pipeline on other collections or views.
- B. It is a different name for collection.
- C. MongoDB does not support views.
Answer: A
Explanation:
https://docs.mongodb.com/manual/core/views/
NEW QUESTION # 134
A social media company needs to implement a data model that describes te relationships between users. When loading real data into the system, it turned out that one user has too many contacts to store them in the designated array. Instead of redesigning the entire system what pattern can you use?
- A. The Schema Versioning Pattern.
- B. The Subset Pattern.
- C. The Outlier Pattern.
- D. The Extended Reference Pattern.
- E. The Attribute Pattern.
Answer: C
Explanation:
https://www.mongodb.com/blog/post/building-with-patterns-the-outlier-pattern
NEW QUESTION # 135
Select all true statements regarding to multikey indexes.
- A. Multikey indexes don't support indexes on multiple array fields on single documents.
- B. An index doesn't become multikey until a document that has an array value is inserted.
- C. Multikey indexes allow us to index on array fields.
Answer: A,B,C
Explanation:
https://docs.mongodb.com/manual/core/index-multikey/
NEW QUESTION # 136
Let's consider a replica set of 3 nodes that experiences a network outage. Select true statement.
- A. When two nodes go down in a three-node replica set, the third node becomes a primary.
- B. When two nodes go down in a three-node replica set, the third node becomes a secondary regardless of whether it started as a primary.
Answer: B
Explanation:
https://docs.mongodb.com/manual/replication/#replication
NEW QUESTION # 137
Which cursor method should you use to force MongoDB to use a specific index for a query?
- A. cursor.hint()
- B. cursor.explain()
- C. cursor.use()
- D. cursor.index()
Answer: A
Explanation:
https://docs.mongodb.com/manual/reference/method/cursor.hint/
NEW QUESTION # 138
Which cursor method should you use to get information about the query plan?
- A. cursor.map()
- B. cursor.hint()
- C. cursor.explain()
Answer: C
Explanation:
https://docs.mongodb.com/manual/reference/method/cursor.explain/
NEW QUESTION # 139
Select all true statements regarding to the role of fields and values in a MongoDB document. (select 2)
- A. You can have duplicate field names within the same level of a single document.
- B. A field is a unique identifier for a specific data point.
- C. Values don't need to be attached to fields and can be standalone data points.
- D. Each field has a value associated with it.
Answer: B,D
Explanation:
https://docs.mongodb.com/manual/core/document/
NEW QUESTION # 140
How to connect to mongod instance and authenticate as root?
- A. mongo --authenticationDatabase admin
- B. mongo --username root --password root123 --authenticationDatabase admin
- C. mongoroot --authenticationDatabase admin
Answer: B
Explanation:
https://docs.mongodb.com/v4.4/mongo/#mongodb-instance-with-authentication
NEW QUESTION # 141
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.
- A. { points: 1, group: 1, map: 1, level: 1 }
- B. { points: 1, group: 1, level: 1, map: 1 }
- C. { map: 1, points: 1, group: 1, level: 1 }
- D. { level: 1, map: 1, points: 1, group: 1 }
Answer: C
Explanation:
https://docs.mongodb.com/manual/indexes/
NEW QUESTION # 142
Which of the following actions are granted to the built-in readWrite role?
- A. update
- B. remove
- C. find
- D. insert
Answer: A,B,C,D
Explanation:
https://docs.mongodb.com/manual/reference/built-in-roles/#mongodb-authrole-readWrite
NEW QUESTION # 143
Which of the following statements are true regarding MongoDB views?
- A. Views are write only.
- B. MongoDB views themselves don't contain data.
- C. MongoDB views are created on demand and reflect the data in the source collection.
- D. Views are read only.
- E. Write operations to views will raise an error.
Answer: B,C,D,E
Explanation:
https://docs.mongodb.com/manual/core/views/
NEW QUESTION # 144
Select all true statements regarding to pipelines and the Aggregation Framework.
- A. Aggregation Framework does not have the group stage for grouping data.
- B. The Aggregation Framework provides us many stages to filter and transform data.
- C. The aggregation pipeline cannot operate on a sharded collection.
- D. An aggregation pipeline consists of one or more stages that process documents.
- E. An aggregation pipeline is an array of stages.
Answer: B,D,E
Explanation:
https://docs.mongodb.com/manual/aggregation/
NEW QUESTION # 145
Suppose you have a developers collection with the following document structure: { _id: 1, fname: 'Bob', lname: 'Smith', tech_stack: [ 'git', 'c++', 'sqlite', 'linux' ] } Select a query that can be executed without errors.
- A. db.developers.updateOne( { _id: 1 }, { $unset: { _id: '' } } )
- B. db.developers.updateOne( { _id: 1 }, { $set: { _id: 3 } } )
- C. db.developers.updateOne( { _id: 1 }, { $set: { fname: 'John' } } )
- D. db.developers.updateOne( { _id: 1 }, { $set: { _id: 3, fname: 'Bob' } } )
Answer: C
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.updateOne/
NEW QUESTION # 146
Suppose you are connected to mongod instance that is already running on port 27000 as admin user. You have to create a new user for an application that has the readWrite role. Use the db.createUser() command to create a user for data analysis. The requirements for this user are: -> role: read on esmartdata database -> username: dataScientist -> password: ds123sci456 Which command should you use?
- A. db.createUser({ user: 'dataScientist', pwd: 'ds123sci456', roles: [{role: 'r', db: 'esmartdata'}] })
- B. db.createUser({ user: 'dataScientist', pwd: 'ds123sci456', roles: [{role: 'write', db: 'esmartdata'}] })
- C. db.createUser({ user: 'dataScientist', pwd: 'ds123sci456', roles: [{role: 'read', db: ''}] })
- D. db.createUser({ user: 'dataScientist', pwd: 'ds123sci456', roles: [{role: 'read', db: 'esmartdata'}] })
Answer: D
Explanation:
https://docs.mongodb.com/manual/reference/method/db.createUser/
NEW QUESTION # 147
You have the following config file: storage: dbPath: /data/db systemLog: destination: file path: /var/log/mongod.log net: bindIp: localhost,192.168.168.62 security: keyFile: /var/pki/keyfile processManagement: fork: true Select all the directories that MongoDB must have access to
- A. /data/db
- B. /var/log
- C. /var/pki
Answer: A,B,C
Explanation:
https://docs.mongodb.com/manual/reference/configuration-options/
NEW QUESTION # 148
Select true statements about data modeling in MongoDB.
- A. If one of your application's main queries is to retrieve related information from different collections, it is usually better to group that information into a single document.
- B. It's good data modeling practice to directly map each table from the relational model (normalized data) to the collection.
- C. To avoid having to join data in the application layer from different collections you can denormalize your data.
Answer: A,C
Explanation:
https://docs.mongodb.com/manual/core/data-modeling-introduction/
NEW QUESTION # 149
Given a movies collection where each document has the following structure: { _id: ObjectId("573a1390f29313caabcd60e4"), genres: [ 'Short', 'Comedy', 'Drama' ], title: 'The Immigrant', year: 1917, imdb: { rating: 7.8, votes: 4680, id: 8133 }, countries: [ 'USA' ] } Which of the following queries will find all Comedy movies that were made in 2000? (select 2)
- A. db.movies.find( { year: 2000, genres: "Comedy" } )
- B. db.movies.find( { year: 2000 }, { genres: "Comedy" } )
- C. db.movies.find( { $and: [ { year: 2000 }, { genres: "Comedy" } ] } )
- D. db.movies.find( { $or: [ { year: 2000 }, { genres: "Comedy" } ] } )
Answer: A,C
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.find/ https://docs.mongodb.com/manual/reference/operator/query/and/
NEW QUESTION # 150
Select all true statements about MongoDB documents.
- A. MongoDB documents must have the same fields in the collection.
- B. MongoDB documents are stored as JSON documents.
- C. MongoDB documents are stored as BSON documents.
- D. MongoDB documents have a flexible schema.
Answer: C,D
Explanation:
https://docs.mongodb.com/manual/core/document/
NEW QUESTION # 151
Select all true statements regarding to replication in MongoDB.
- A. In the event of failover, the nodes vote to select the new primary node.
- B. Replication is the primary mechanism for providing high availability in MongoDB.
- C. The primary node receives all new write operations, and the secondary nodes stay up to date with the primary.
Answer: A,B,C
Explanation:
https://docs.mongodb.com/manual/replication/
NEW QUESTION # 152
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MongoDB C100DEV certification exam is an excellent way for developers to demonstrate their expertise in using MongoDB. It is a globally recognized certification that validates an individual's skills and knowledge in developing applications using MongoDB. To prepare for the exam, candidates can use MongoDB's official documentation, online training courses, practice tests, and certification study group.
The C100DEV exam covers a wide range of topics, including data modeling, indexing, query optimization, aggregation, and application development. It is a performance-based exam that consists of practical tasks, hands-on exercises, and multiple-choice questions. C100DEV exam is conducted online and can be taken from anywhere in the world. However, it is recommended that candidates have at least six months of experience working with MongoDB before attempting the exam.
Latest MongoDB C100DEV Practice Test Questions: https://www.getvalidtest.com/C100DEV-exam.html
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