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Download MongoDB Certified Developer Associate Exam Exam Dumps
NEW QUESTION 28
It's very important to picking a good shard key. If we don't choose a good shard key, then we won't be able to see the benefits of horizontal scaling.
- A. True
- B. False
Answer: A
Explanation:
https://docs.mongodb.com/manual/core/sharding-shard-key/
NEW QUESTION 29
Select the method that forces MongoDB to use a specific index.
- A. explain()
- B. force()
- C. hint()
- D. index()
Answer: C
Explanation:
https://docs.mongodb.com/manual/reference/method/cursor.hint/
NEW QUESTION 30
Suppose you have a reviews collection in your database and you want to optimize the following query: db.reviews.find( { "votes": { "$gt": 100 }, "rating": 4.5 } ).sort( { "date": 1 } ) Which index on this collection will be the most performant for the above query? Keep in mind the equality, sort, range rule.
- A. { date: 1, votes: 1, rating: 1 }
- B. { votes: 1, rating: 1, date: 1 }
- C. { rating: 1, date: 1, votes: 1 }
- D. { date: 1, rating: 1, votes: 1 }
- E. { rating: 1, votes: 1, date: 1 }
- F. { votes: 1, date: 1, rating: 1 }
Answer: C
Explanation:
The most efficient index for the given query should follow the equality, sort, range rule which is in this case: { rating: 1, date: 1, votes: 1 } https://docs.mongodb.com/manual/indexes/
NEW QUESTION 31
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