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MongoDB Certified Developer Associate Exam Sample Questions (Q20-Q25):

NEW QUESTION # 20
Select all true statements about the $merge stage.

• A. $merge stage must be the last in the pipeline.
• B. $merge stage allows us to output the documents to a collection in the same or different database.
• C. $merge stage allows us to output the documents to a sharded collection.

Answer: A,B,C Explanation:
https://docs.mongodb.com/manual/reference/operator/aggregation/merge/
NEW QUESTION # 21
What is a MongoDB view?

• A. MongoDB does not support views.
• B. It is a different name for collection.
• C. A MongoDB view is a queryable object whose contents are defined by an aggregation pipeline on other collections or views.

Answer: C Explanation:
https://docs.mongodb.com/manual/core/views/
NEW QUESTION # 22
Which of the following scenarios is best suited for applying the Attribute Pattern?

• A. The documents in the collection are quite large.
• B. You need to apply document validation before inserting/modifying.
• C. Some fields share a similar characteristics, and you want to search across those fields.

Answer: C Explanation:
https://www.mongodb.com/blog/post/building-with-patterns-the-attribute-pattern
NEW QUESTION # 23
Select all valid BSON types in MongoDB. (select 4)

• A. Array
• B. Dictionary
• C. ObjectId
• D. String
• E. Boolean

Answer: A,C,D,E Explanation:
https://docs.mongodb.com/manual/reference/bson-types/
NEW QUESTION # 24
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 data analysis. The requirements for this user are: -> role: read on esmartdata database -> username: dataScientist -> password: ds123sci456 Which command should you use?

• A. db.createUser({ user: 'dataScientist', pwd: 'ds123sci456', roles: [{role: 'r', db: 'esmartdata'}] })
• B. db.createUser({ user: 'dataScientist', pwd: 'ds123sci456', roles: [{role: 'read', db: ''}] })
• C. db.createUser({ user: 'dataScientist', pwd: 'ds123sci456', roles: [{role: 'write', db: 'esmartdata'}] })
• D. db.createUser({ user: 'dataScientist', pwd: 'ds123sci456', roles: [{role: 'read', db: 'esmartdata'}] })

Answer: D Explanation:
https://docs.mongodb.com/manual/reference/method/db.createUser/
NEW QUESTION # 25
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