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NEW QUESTION 53
A collection called players contains documents with the following structure: { _id: 1, user: ‘Tom’, scores: [ 23, 56, 3, 52, 62 ], bonus: 5 } { _id: 2, user: ‘Jane’, scores: [ 42, 50, 10 ], bonus: 3 } You have the following query: db.players.aggregate([{ $addFields: { total_score: { $sum: ‘$scores’ }, avg_score: { $avg: ‘$scores’ } } }, { $addFields: { total_score_with_bonus: { $add: [‘$total_score’, ‘$bonus’] } } }, { $match: { bonus: { $gt: 4 } } }]) How can you optimize this query?
- A. Moving the $match stage to the second stage of this pipeline. [{ $addFields: { total_score: { $sum: ‘$scores’ }, avg_score: { $avg: ‘$scores’ } } }, { $match: { bonus: { $gt: 4 } } }, { $addFields: { total_score_with_bonus: { $add: [‘$total_score’, ‘$bonus’] } } }]
- B. Moving the $match stage to the beginning of the pipeline. [{ $match: { bonus: { $gt: 4 } } }, { $addFields: { total_score: { $sum: ‘$scores’ }, avg_score: { $avg: ‘$scores’ } } }, { $addFields: { total_score_with_bonus: { $add: [‘$total_score’, ‘$bonus’] } } }]
- C. This query cannot be optimized.
Answer: B
Explanation:
https://docs.mongodb.com/manual/reference/operator/aggregation/match/ https://docs.mongodb.com/manual/core/aggregation-pipeline-optimization/
NEW QUESTION 54
You are working in a team on a certain application in the gaming sector. Queries similar to the following are quite often executed by your application. db.gamers.find( { level: 10, is_active: true } ) How can you speed up the execution of similar queries? Choose the best option.
- A. db.gamers.createIndex( { level: 1 } )
- B. There is no way to speed up this query.
- C. Create the given index:
- D. Create the given index:
- E. db.gamers.createIndex( { is_active: 1 } )
- F. Create the given index:
- G. db.gamers.createIndex( { level: 1, is_active: 1 } )
Answer: G
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.createIndex/
NEW QUESTION 55
Suppose you insert the following documents into a companies collection:
db.companies.insertMany([ {“name”: “Facebook”}, {“name”: “Twitter”} ])
Select all true statements about this command. (select 3)
- A. This command will insert two documents into the collection.
- B. This command will insert one document into the collection.
- C. MongoDB will automatically create an _id field for each document and it will be unique.
- D. The _id field is not specified in any of these documents.
Answer: A,C,D
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.insertMany/
NEW QUESTION 56
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