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MongoDB C100DEV Exam details, Passing Score, and Time Limit

• Exam Duration: 90 minute
• Exam Length: 60 Question
• Passing score: 60%
• Language: English
• Exam Format: Multiple choice questions

Prerequisites of MongoDB Certified Developer Associate Exam

The MongoDB Certified Developer Associate Exam is a multiple-choice exam. Prerequisites: To take the exam, you must first become a member of the MongoDB University Program. You can do this by registering for an account at MongoDB signup. The following are recommended prerequisites for taking this exam:

• Working knowledge of UNIX or Linux operating systems.
• An understanding of JavaScript programming;
• Basic knowledge of SQL and relational databases;

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MongoDB Certified Developer Associate Exam Sample Questions (Q46-Q51):

NEW QUESTION # 46
How to connect to MongoDB with mongod to localhost running on port 27017?

• A. mongo --host 127.0.0.1:27000
• B. mongo --host 127.0.0.1:27017
• C. mongoconnect --host 127.0.0.1:27017

Answer: B Explanation:
https://docs.mongodb.com/v4.4/mongo/#mongodb-instance-on-a-remote-host
NEW QUESTION # 47
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 a CRUD application. The requirements for this user are: -> role: readWrite on esmartdata database -> username: esmart -> password: esmart123 Which command should you use?

• A. db.createUser({ user: 'esmart', pwd: 'esmart123', roles: [{role: 'readWrite', db: 'esmartdata'}] })
• B. db.createUser({ user: 'esmart', pwd: 'esmart123', roles: [{role: 'read', db: 'esmartdata'}] })
• C. db.createUser({ user: 'esmart', pwd: 'esmart123', roles: [{role: 'readWrite', db: ''}] })
• D. db.createUser({ user: 'esmart', pwd: 'esmart123', roles: [{role: 'read+write', db: 'esmartdata'}] })

Answer: A Explanation:
https://docs.mongodb.com/manual/reference/method/db.createUser/
NEW QUESTION # 48
Can you create a unique index in MongoDB?

• A. No
• B. Yes

Answer: B Explanation:
https://docs.mongodb.com/manual/core/index-unique/
NEW QUESTION # 49
Let's consider a one-to-many relationship observed between an instructor and the courses he is created on an e-learning platform. We assume that a course can only have one instructor, and an instructor can have multiple courses. Which of the following are the correct ways to represent this one-to-many relationship with a document model in MongoDB?

• A. Embed the entities for the courses as an array of sub-documents in the corresponding instructor document.
• B. Embed all the fields for a course as a subdocument in the corresponding instructor document.
• C. Have a collection for the instructors and a collection for the courses with each course document having a field to reference the document of its instructor.

Answer: A,C Explanation:
Embed all the fields for a course as a subdocument in the corresponding instructor document.
These subdocuments must be put into an array, not stored directly as a subdocument in its parent.
This way we can have a variable number of referenced documents and use a multi-key index to search the "many" side. This is not the best way to do it.
https://docs.mongodb.com/manual/tutorial/model-embedded-one-to-many-relationships-between-documents/
NEW QUESTION # 50
Suppose you have a mobilegames collection with the following document structure: { game: "Fishing Clash", company: "Ten Square Games", platforms: ['Android', 'IOS'], ... releaseUSA: ISODate("2017-04-09T01:00:00+01:00"), releaseFrance: ISODate("2017-04-09T01:00:00+01:00"), releaseItaly: ISODate("2017-08-17T01:00:00+01:00"), ... } Are there any problems with this document structure?

• A. Yes, a search for a release date will require looking across many fields at once which is inefficient.
• B. No, everything is correct. There is no room for improvement.

Answer: A Explanation:
https://docs.mongodb.com/manual/core/document/
NEW QUESTION # 51
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