[Jul 23, 2023] Free4Torrent C100DEV Exam Practice Test Questions (Updated 253 Questions)
Pass MongoDB C100DEV Exam Info and Free Practice Test
MongoDB Certified Developer Associate Exam is an industry-recognized certification that validates the skills and knowledge of developers who work with MongoDB. C100DEV exam is designed to test the candidate's ability to design, develop, and deploy applications using MongoDB. It is a comprehensive exam that covers various aspects of MongoDB, including data modeling, indexing, querying, and aggregation.
NEW QUESTION # 124
The following capped collection is given: db.createCollection('latest_news', {'capped': true, 'size': 10000, 'max': 3}) [ { _id: ObjectId("61e8007c9b3067e362440a88"), title: 'COVID records broken again as weekend brings nearly 40K new cases' }, { _id: ObjectId("61e800989b3067e362440a89"), title: 'Bitcoin, Ethereum, Dogecoin Face Fresh Round Of Regulatory Scrutiny' }, { _id: ObjectId("61e800d19b3067e362440a8a"), title: 'Where Six Meme Stock Investors Are Now' } ] What the latest_news collection will look like after the following operation?
- A. [ { _id: ObjectId("61e8007c9b3067e362440a88"), title: 'COVID records broken again as weekend brings nearly 40K new cases' }, { _id: ObjectId("61e800989b3067e362440a89"), title: 'Bitcoin, Ethereum, Dogecoin Face Fresh Round Of Regulatory Scrutiny' }, { _id: ObjectId("61e800d19b3067e362440a8a"), title: 'Where Six Meme Stock Investors Are Now' } ]
- B. [ { _id: ObjectId("61e8007c9b3067e362440a88"), title: 'COVID records broken again as weekend brings nearly 40K new cases' }, { _id: ObjectId("61e800989b3067e362440a89"), title: 'Bitcoin, Ethereum, Dogecoin Face Fresh Round Of Regulatory Scrutiny' }, { _id: ObjectId("61e800d19b3067e362440a8a"), title: 'Where Six Meme Stock Investors Are Now' }, { _id: ObjectId("61e801439b3067e362440a8b"), title: 'TikTok owner ByteDance dissolves its investment arm' } ]
- C. db.latest_news.insertOne({title: 'TikTok owner ByteDance dissolves its investment arm'}) [ { _id: ObjectId("61e800989b3067e362440a89"), title: 'Bitcoin, Ethereum, Dogecoin Face Fresh Round Of Regulatory Scrutiny' }, { _id: ObjectId("61e800d19b3067e362440a8a"), title: 'Where Six Meme Stock Investors Are Now' }, { _id: ObjectId("61e801439b3067e362440a8b"), title: 'TikTok owner ByteDance dissolves its investment arm' } ]
Answer: C
Explanation:
https://docs.mongodb.com/manual/core/capped-collections/
NEW QUESTION # 125
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 } )
- A. None of these.
- B. As a collection scan.
- C. As an index scan.
Answer: B
Explanation:
https://docs.mongodb.com/manual/indexes/
NEW QUESTION # 126
We can use this pattern to work with different schema versions. It mainly involves adding a new field to the document structure, such as schema_version. This field will allow our application to know how to handle particular document. Which pattern does this description apply to?
- A. The Subset Pattern.
- B. The Attribute Pattern.
- C. The Schema Versioning Pattern.
- D. The Polymorphic Pattern.
- E. The Outlier Pattern.
Answer: C
Explanation:
https://www.mongodb.com/blog/post/building-with-patterns-the-schema-versioning-pattern
NEW QUESTION # 127
What is the built-in database called config in MongoDB for?
- A. The config database plays an important role in the authentication and authorization process. Certain actions performed by administrators also require access to this database.
- B. The config database stores data describing the MongoDB server. For replica sets, it also stores information about the replication process.
- C. The config database is used to store information about shards in shared MongoDB cluster.
Answer: C
Explanation:
https://docs.mongodb.com/manual/reference/config-database/
NEW QUESTION # 128
We have the following schema for a movies collection: { _id: ObjectId, title: String, genres: Array, languages: Array, year: 32-bit integer } And the following index on the movies collection: { title: 1 } Which of the following queries will use the given index to perform the sorting stage?
- A. db.movies.find( { genres: "Drama" } ).sort( { year: 1 } )
- B. db.movies.find( {} ).sort( { title: -1 } )
- C. db.movies.find( {} ).sort( { title: 1 } )
- D. db.movies.find( { genres: "Drama" } ).sort( { title: 1 } )
Answer: B,C,D
Explanation:
db.movies.find( { genres: "Drama" } ).sort( { title: 1 } ) Yes, in this case the index will be used to retrieve the sorted documents and then it will filter the movies matching the genre. https://docs.mongodb.com/manual/indexes/
NEW QUESTION # 129
Suppose you want to join two collections in the same database. What aggregation stage do you need to use?
- A. $out
- B. $lookup
- C. $project
Answer: B
Explanation:
https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/
NEW QUESTION # 130
What stages will cause a merge on the primary shard for a database?
- A. $lookup
- B. $group
- C. $out
Answer: A,C
Explanation:
$group stage can potentially result in a merge, but a random shard will be selected for the merging.
https://docs.mongodb.com/manual/reference/operator/aggregation/out/
https://docs.mongodb.com/manual/reference/operator/aggregation/lookup/
https://docs.mongodb.com/manual/reference/operator/aggregation/group/
NEW QUESTION # 131
Does MongoDB support query operations that perform a text search of string content?
- A. No
- B. Yes
Answer: B
Explanation:
https://docs.mongodb.com/manual/text-search/
NEW QUESTION # 132
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": /^B./, "nationality": 'France' } )
- A. None of these.
- B. As an index scan.
- C. As a collection scan.
Answer: B
Explanation:
https://docs.mongodb.com/manual/indexes/
NEW QUESTION # 133
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 do not contain the Comedy and Romance genres?
- A. db.movies.find( { genres: { $or: ["Comedy", "Romance"] } } )
- B. db.movies.find( { genres: { $in: ["Comedy", "Romance"] } } )
- C. db.movies.find( { genres: { $nin: ["Comedy", "Romance"] } } )
Answer: C
Explanation:
https://docs.mongodb.com/manual/reference/operator/query/nin/
NEW QUESTION # 134
Suppose you have an accounts collection with the following document structure: { _id: ObjectId("61af47c6e29861661d063714"), account_id: 1010, type: 'investment', limit: 1000000 }, { _id: ObjectId("61af47c6e29861661d063715"), account_id: 4336, type: 'derivatives', limit: 100000 }, { _id: ObjectId("61af47c6e29861661d063716"), account_id: 4336, type: 'commodity', limit: 1000 } Which of the following documents would be modified by this update? db.accounts.updateMany( { "type": "investment" }, { "$set": { "limit": 2000000 } } )
- A. { _id: ObjectId("61b1bde1ceb6f770f56b0cd9"), account_id: 4915, type: 'investment', limit: 1000000 }
- B. { _id: ObjectId("61af47c6e29861661d067825"), account_id: 7355, type: 'commodity', limit: 500000 }
- C. { _id: ObjectId("61af47c6e29861661d063715"), account_id: 4336, type: 'derivatives', limit: 100000 }
- D. { _id: ObjectId("61af47c6e29861661d063714"), account_id: 1010, type: 'investment', limit: 1000000 }
Answer: A,D
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.updateMany/
NEW QUESTION # 135
Data modeling. You are considering the use of nesting or the references in your data model. Data read operations must be fast. Which option would be more appropriate?
- A. Use of nesting.
- B. Use of reference.
Answer: A
Explanation:
https://docs.mongodb.com/manual/core/data-modeling-introduction/
NEW QUESTION # 136
What is the best practice in using the $match operator?
- A. It doesn't matter when we apply $match stage.
- B. The later in the pipeline, the better.
- C. 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.
Answer: C
Explanation:
https://docs.mongodb.com/manual/reference/operator/aggregation/match/
NEW QUESTION # 137
How to connect to mongod instance and authenticate as root?
- A. mongoroot --authenticationDatabase admin
- B. mongo --authenticationDatabase admin
- C. mongo --username root --password root123 --authenticationDatabase admin
Answer: C
Explanation:
https://docs.mongodb.com/v4.4/mongo/#mongodb-instance-with-authentication
NEW QUESTION # 138
Select all default configurations for mongod.
- A. By default, mongod doesn't enforce authentication.
- B. By default, mongod is only bound to localhost (or 127.0.0.1).
- C. The default port for mongod is 27017.
- D. The default data directory for mongod is /data/db
Answer: A,B,C,D
Explanation:
https://docs.mongodb.com/manual/reference/configuration-options/
NEW QUESTION # 139
Select true statements about capped collections.
- A. If the collection is full, the oldest document in the collection is removed when a new document is added to the collection.
- B. Capped collections are fixed-size collections.
- C. Capped collections automatically remove the oldest documents in the collection to make room for new documents.
- D. Capped collections guarantee preservation of the insertion order.
Answer: A,B,C,D
Explanation:
https://docs.mongodb.com/manual/core/capped-collections/
NEW QUESTION # 140
Why adding indexes may lead to slower write operations?
- A. Because we also need to update the index.
- B. Because we have less and less disk space.
Answer: A
Explanation:
https://docs.mongodb.com/manual/indexes/
NEW QUESTION # 141
In your database there is a movies collection with the following document structure: { _id: ObjectId("573a1390f29313caabcd42e8"), genres: [ 'Short', 'Western' ], title: 'The Great Train Robbery', rated: 'TV-G', year: 1903, imdb: { rating: 7.4, votes: 9847, id: 439 }, countries: [ 'USA' ] }, { _id: ObjectId("573a1390f29313caabcd4323"), genres: [ 'Short', 'Drama', 'Fantasy' ], rated: 'UNRATED', title: 'The Land Beyond the Sunset', year: 1912, imdb: { rating: 7.1, votes: 448, id: 488 }, countries: [ 'USA' ] } Which of the following queries will return only the title for the five oldest movies in this collection?
- A. db.movies.find( {}, { title: 1, _id: 0 } ).sort( { year: 1 } ).skip(5).limit(5)
- B. db.movies.find( {}, { title: 1 } ).sort( { year: 1 } ).limit(5)
- C. db.movies.find( {}, { title: 1, _id: 0 } ).sort( { year: 1 } ).skip(5)
- D. db.movies.find( {}, { title: 1, _id: 0 } ).sort( { year: 1 } ).limit(5)
Answer: D
Explanation:
https://docs.mongodb.com/manual/reference/method/cursor.sort/
NEW QUESTION # 142
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If you are a developer who wants to validate your skills in working with MongoDB, earning the C100DEV certification is a great way to do so. MongoDB Certified Developer Associate Exam certification exam is designed to test your knowledge and skills in working with MongoDB and can help you stand out in a competitive job market. Whether you are an individual looking to advance your career or an organization looking to hire skilled MongoDB developers, the C100DEV certification exam is a valuable credential to have.
MongoDB C100DEV, also known as the MongoDB Certified Developer Associate exam, is a certification offered by MongoDB to developers who are proficient with the MongoDB database system. C100DEV exam tests the candidate's knowledge of MongoDB's features, data modeling, schema design, CRUD operations, indexing, and querying, among other topics. Successful completion of the exam demonstrates a developer's understanding of MongoDB's best practices and abilities to design and implement MongoDB-based applications.
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