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MongoDB Certified Developer Associate Exam Sample Questions (Q188-Q193):
NEW QUESTION # 188
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: { $ne: ['$name', '$twitter_username'] } } )
- B. db.companies.find( { $expr: { $eq: ['name', 'twitter_username'] } } )
- C. db.companies.find( { $expr: { $eq: ['$name', 'twitter_username'] } } )
- D. db.companies.find( { $expr: { $eq: ['$name', '$twitter_username'] } } )
Answer: D
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 # 189
Select all true statements regarding to replication in MongoDB.
- A. The primary node receives all new write operations, and the secondary nodes stay up to date with the primary.
- B. Replication is the primary mechanism for providing high availability in MongoDB.
- C. In the event of failover, the nodes vote to select the new primary node.
Answer: A,B,C
Explanation:
https://docs.mongodb.com/manual/replication/
NEW QUESTION # 190
Select all true statements regarding to schema validation in MongoDB.
- A. Validation rules are on a per-collection basis.
- B. We need to use db.createCollection() with the validator option to specify validation rules for a new collection.
- C. MongoDB doesn't provide the capability to perform schema validation during updates and insertions.
Answer: A,B
Explanation:
https://docs.mongodb.com/manual/core/schema-validation/
NEW QUESTION # 191
Which collection method can you use to build the index?
- A. db.collection.insert()
- B. db.collection.getIndexes()
- C. db.collection.createIndex()
- D. db.collection.create()
Answer: C
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.createIndex/
NEW QUESTION # 192
Which command do you use to display all indexes in routes collection?
- A. db.routes.indexes()
- B. db.routes.getIndexes()
- C. db.routes.dropIndex()
- D. db.routes.dropIndex()
Answer: B
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.getIndexes/
NEW QUESTION # 193
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