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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.
It helps you stand out from other candidates when applying for jobs or promotions within an organization that uses MongoDB.
You will increase your chances of being promoted within your current organization if you have any other relevant certifications such as M100DBA or M100ADMIN
For more info read reference:
MongoDB C100DEV Exam Reference
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MongoDB Certified Developer Associate Exam Sample Questions (Q41-Q46):
NEW QUESTION # 41
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: { $eq: ['$name', 'twitter_username'] } } )
- C. db.companies.find( { $expr: { $ne: ['$name', '$twitter_username'] } } )
- D. db.companies.find( { $expr: { $eq: ['name', 'twitter_username'] } } )
Answer: A
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 # 42
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("61af47c6e29861661d063715"), account_id: 4336, type: 'derivatives', limit: 100000 }
- B. { _id: ObjectId("61b1bde1ceb6f770f56b0cd9"), account_id: 4915, type: 'investment', limit: 1000000 }
- C. { _id: ObjectId("61af47c6e29861661d063714"), account_id: 1010, type: 'investment', limit: 1000000 }
- D. { _id: ObjectId("61af47c6e29861661d067825"), account_id: 7355, type: 'commodity', limit: 500000 }
Answer: B,C
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.updateMany/
NEW QUESTION # 43
Suppose you have a developers collection with only two documents:
{ _id: 1, lname: 'Smith', tech_stack: [ 'sql', 'git', 'python', 'django' ], fname: 'Bob' }, { _id: 2, fname: 'Michael', lname: 'Doe', tech_stack: [ 'git', 'python', 'sqlite', 'linux', 'flask' ] }
Using Aggregation Framework you run the following stage:
{ $unwind: { path: '$tech_stack' } }
How many documents will you have in the pipeline after the $unwind stage?
- A. 0
- B. 1
- C. 2
- D. 3
- E. 4
Answer: B
Explanation:
https://docs.mongodb.com/manual/reference/operator/aggregation/unwind/
NEW QUESTION # 44
You have to create a simple configuration file for mongod instance. Here are the requirements of your mongod instance: * stores data files in /var/mongo/db * listens to connection from localhost * runs on port 27000 * uses authentication Which of the following configuration file meet these requirements?
- A. net:
bindIp: localhost
port: 27000
security:
authorization: enabled - B. storage:
dbPath: /var/mongodb/db
net:
bindIp: localhost
port: 27000 - C. storage:
dbPath: /var/mongodb/db
net:
bindIp: localhost
port: 27000
security:
authorization: enabled - D. storage:
dbPath: /var/mongodb/db
security:
authorization: enabled
Answer: A
Explanation:
https://docs.mongodb.com/manual/reference/configuration-options/
NEW QUESTION # 45
Select all true statements regarding to the role of fields and values in a MongoDB document. (select 2)
- A. A field is a unique identifier for a specific data point.
- B. You can have duplicate field names within the same level of a single document.
- 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: A,D
Explanation:
https://docs.mongodb.com/manual/core/document/
NEW QUESTION # 46
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