Free Access MongoDB.C100DEV.v2025-04-24.q83 Practice Test (Page 9)

Question 36

Select all true statements about the update operation. (select 2)

A.updateOne() method with the $set operator updates the first document that matches the query.

B.If the field doesn't exist, updateOne() method with the $set operator will not add a new field with the specified value.

C.updateOne() method with the $set operator updates an existing document field with the given value.

Question 37

Suppose you have a books collection with title field. Which of the following queries will return all books with a title ending in 'ian'?

A.db.movies.find( { title: { $regex: /.*ian$/ } } )

B.db.movies.find( { title: { $text: /.*ian$/ } } )

C.db.movies.find( { title: { $regex: /.*ian/ } } )

D.db.movies.find( { title: { $regex: /ian/ } } )

Question 38

We have an accounts collection with only one document: { _id: 54657, account_id: 557378, products: [ 'InvestmentStock', 'Commodity', 'CurrencyService' ] } We need to use Aggregation Framework to unwind the products Array to obtain new documents with only one product per document (see below). Expected output: [ { _id: 54657, account_id: 557378, products: 'InvestmentStock' }, { _id: 54657, account_id: 557378, products: 'Commodity' }, { _id: 54657, account_id: 557378, products: 'CurrencyService' } ] Which pipeline should you use?

A.[{ $facet: { path: "$products", } }]

B.[{ $unwind: { path: "$products", } }]

C.[{ $unset: { path: "$products", } }]

D.[{ $project: { path: "$products", } }]

Question 39

Use case: e-learning platform Which of the following scenarios is the best candidate to use the Subset Pattern?

A.Our app needs to retrieve a course and its ten most recent reviews.

B.Our app needs to retrieve a course and information about its instructor.

C.A course model needs to store references to image of the course that are kept in an external location outside the database.

D.A course model needs to store a counter representing the number of times it was purchased.

Question 40

Select all true statements regarding to replication in MongoDB.

A.Replication is the primary mechanism for providing high availability in MongoDB.

B.In the event of failover, the nodes vote to select the new primary node.

C.The primary node receives all new write operations, and the secondary nodes stay up to date with the primary.

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Question 36

Question 37

Question 38

Question 39

Question 40

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