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MongoDB Certified Developer Associate Exam Sample Questions (Q153-Q158):

NEW QUESTION # 153
Which of the following documents are valid JSON format? (select 2)

A. {"_id": 1, "name": "Riviera Caterer", "cuisine": "American"}
B. <"_id": 1, "name": "Riviera Caterer", "cuisine": "American">
C. {"_id": 1, "address": {"street": "Stillwell Avenue", "zipcode": "11224"}}
D. {_id: 1, name: "Riviera Caterer", cuisine: "American"}
E. ["_id": 1, "name": "Riviera Caterer", "cuisine": "American"]

Answer: A,C

Explanation:
While some software may not throw an error, this is still not valid JSON because each field name should be in quotes: {_id: 1, name: "Riviera Caterer", cuisine: "American"} Square brackets instead of curly ones: ["_id": 1, "name": "Riviera Caterer", "cuisine": "American"] The rest of the examples are self-evident. https://www.mongodb.com/json-and-bson

NEW QUESTION # 154
Use case: e-learning platform Which of the following scenarios is the best candidate to use the Computed Pattern?

A. Our app needs to retrieve a course and its ten most recent reviews.
B. A course model needs to store a counter representing the number of times it was purchased.
C. A course model needs to store references to image of the course that are kept in an external location outside the database.
D. Our app needs to retrieve a course and information about its instructor.

Answer: B

Explanation:
https://www.mongodb.com/blog/post/building-with-patterns-the-computed-pattern

NEW QUESTION # 155
Assign typical operational tasks to the Data Scientist.

A. read data
B. write data
C. create user, create index
D. write data, read data

Answer: A

NEW QUESTION # 156
We have the following indexes: { name: 1, founded_year: 1 } { tag_list: 1, is_active: 1 } And the following documents: { _id: ObjectId("52cdef7c4bab8bd675297daa"), name: "Sparter", founded_year: 2007, tag_list: ["gaming", "game", "wow"], is_active: true }, { _id: ObjectId("52cdef7c4bab8bd675297da3"), name: "Yahoo!", founded_year: 1994, tag_list: ["search", "webmail"], is_active: true } Select true statement.

A. There would be a total of 2 index keys created across all of these documents and indexes.
B. There would be a total of 4 index keys created across all of these documents and indexes.
C. There would be a total of 7 index keys created across all of these documents and indexes.

Answer: C

Explanation:
https://docs.mongodb.com/manual/core/index-multikey/

NEW QUESTION # 157
Which cursor method should you use to force MongoDB to use a specific index for a query?

A. cursor.index()
B. cursor.explain()
C. cursor.use()
D. cursor.hint()

Answer: D

Explanation:
https://docs.mongodb.com/manual/reference/method/cursor.hint/

NEW QUESTION # 158
......

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