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The advantages of having a MongoDB C100DEV Certification

MongoDB is one of the most popular databases in use today and it is used by many companies and organizations. The MongoDB C100DEV is a certification that ensures that the person has the knowledge and skills required to work with MongoDB effectively. In this article, we will discuss some of the benefits of having this certification.

• You will increase your chances of being promoted within your current organization if you have any other relevant certifications such as M100DBA or M100ADMIN
• It helps you stand out from other candidates when applying for jobs or promotions within an organization that uses MongoDB.

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MongoDB Certified Developer Associate Exam Sample Questions (Q229-Q234):

NEW QUESTION # 229
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 extract all movies from this collection where genres includes both 'Crime' and 'Mystery'. Which query should we use?

• A. db.movies.find( { genres: { $in: ["Crime", "Mystery"] } } )
• B. db.movies.find( { genres: { $any: ["Crime", "Mystery"] } } )
• C. db.movies.find( { genres: { $nin: ["Crime", "Mystery"] } } )
• D. db.movies.find( { genres: { $all: ["Crime", "Mystery"] } } )

Answer: D Explanation:
https://docs.mongodb.com/manual/reference/operator/query/all/
NEW QUESTION # 230
You have a developers collection with the following document structure: { id: 1, fname: 'John', lname: 'Smith', techstack: ['sql', 'git', 'python', 'linux', 'django', 'aws'] }, { id: 2, fname: 'Michael', lname: 'Doe', techstack: [ 'git', 'python', 'sqlite', 'linux', 'flask' ] } Which of the following queries will return only the first three elements of the array in the tech_stack field?

• A. db.developers.find( {}, { tech_stack: [0, 3] } )
• B. db.developers.find( {}, { tech_stack: [0, 1, 2] } )
• C. db.developers.find( { tech_stack: { $slice: [0, 3] } } )
• D. db.developers.find( {}, { tech_stack: { $slice: [0, 3] } } )

Answer: D Explanation:
https://docs.mongodb.com/manual/reference/operator/update/slice/
NEW QUESTION # 231
We have the following indexes in a movies collection: { _id: 1 } { title: 1, year: 1 } Which of the following queries can be covered by one of the given indexes?

• A. db.movies.find( { genres: "Crime" }, { _id: 0, title: 1, year: 1, genres: 1 } )
• B. db.movies.find( { title: { $in: [ "Death Note", "The Immigrant" ] } }, { _id: 0, title: 1, year: 1 } )
• C. db.movies.find( { title: { $in: [ "Death Note", "The Immigrant" ] } }, { _id: 0, title: 1, year: 1, genres: 1 } )

Answer: B Explanation:
No, this query would use the { title: 1, year: 1 } index, but it is projecting the genres field. https://docs.mongodb.com/manual/core/query-optimization/#covered-query
NEW QUESTION # 232
Select all true statements about MongoDB documents.

• A. MongoDB documents have a flexible schema.
• B. MongoDB documents must have the same fields in the collection.
• C. MongoDB documents are stored as JSON documents.
• D. MongoDB documents are stored as BSON documents.

Answer: A,D Explanation:
https://docs.mongodb.com/manual/core/document/
NEW QUESTION # 233
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 Extended Reference Pattern.
• B. The Subset Pattern.
• C. The Outlier Pattern.
• D. The Attribute Pattern.
• E. The Schema Versioning Pattern.

Answer: C Explanation:
https://www.mongodb.com/blog/post/building-with-patterns-the-outlier-pattern
NEW QUESTION # 234
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