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MongoDB Certified Developer Associate Exam Sample Questions (Q239-Q244):
NEW QUESTION # 239
Suppose you have a sales collection with the following document structure: { _id: ObjectId("5bd761dcae323e45a93ccfe8"), saleDate: ISODate("2015-03-23T21:06:49.506Z"), items: [ { name: 'printer paper', tags: [ 'office', 'stationary' ], price: Decimal128("40.01"), quantity: 2 } { name: 'pens', tags: [ 'writing', 'office', 'school', 'stationary' ], price: Decimal128("56.12"), quantity: 5 }, { name: 'notepad', tags: [ 'office', 'writing', 'school' ], price: Decimal128("18.47"), quantity: 2 } ], storeLocation: 'Denver', couponUsed: true, purchaseMethod: 'Online' } Which operator should you use to extract all sales documents that have 'notepad' name in items field?
- A. $elemMatch
- B. $all
- C. $match
- D. $in
- E. $nin
Answer: A
Explanation:
https://docs.mongodb.com/manual/reference/operator/query/elemMatch/
NEW QUESTION # 240
Which cursor method should you use to return the number of documents in the result set?
- A. cursor.explain()
- B. cursor.count()
- C. cursor.total()
- D. cursor.sum()
Answer: B
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.count/
NEW QUESTION # 241
Use case: e-learning platform Which of the following scenarios is the best candidate to use the Extended Reference Pattern to avoid additional reads by joins/lookups?
- A. Our app needs to retrieve a course and information about its instructor.
- 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 its ten most recent reviews.
Answer: A
Explanation:
https://www.mongodb.com/blog/post/building-with-patterns-the-extended-reference-pattern
NEW QUESTION # 242
Select all true statements about text search in MongoDB.
- A. MongoDB provides text indexes to support text search queries on string content.
- B. A collection can only have one text search index, but that index can cover multiple fields.
- C. To perform text search queries, you must have a text index on your collection.
- D. Text indexes can include any field whose value is a string.
- E. Text indexes cannot include any field whose value is an array of string elements.
- F. To perform text searches on a collection we use $text operator.
Answer: A,B,C,D,F
Explanation:
https://docs.mongodb.com/manual/text-search/
NEW QUESTION # 243
What does it command do in the mongo shell?
- A. it is not a mongo shell command.
- B. Displays cluster statistics.
- C. Iterates through the cursor results.
- D. Terminates the current query execution.
Answer: C
NEW QUESTION # 244
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