Free Access MongoDB.C100DEV.v2025-04-24.q83 Practice Test (Page 12)

Question 51

Select all true statement regarding to the MongoDB (BSON, JSON). (select 3)

A.MongoDB stores data in BSON, and we can view it in JSON.

B.MongoDB stores data in JSON, and we can view it in BSON.

C.BSON supports as many data types as JSON.

D.BSON supports more data types than JSON.

E.BSON is faster to parse and lighter to store than JSON.

Question 52

What do you mean by collection scan during query execution?

A.It can use the index to limit the number of documents it must check.

B.It scans every document in a collection, to select those documents that match the query.

Question 53

In your database there is a collection named companies with the following document structure: { name: 'Wize', relationships: [ { is_past: false, title: 'Head of Product', person: { first_name: 'Ethan', last_name: 'Smith', permalink: 'ethan-smith' } }, { is_past: true, title: 'Director, Business Development', person: { first_name: 'Stephanie', last_name: 'Quay', permalink: 'stephanie-quay' } }, { is_past: true, title: 'Sr. Engineer', person: { first_name: 'Stefan', last_name: 'Antonowicz', permalink: 'stefan-antonowicz' } } ] } Which of the following queries should you use to extract all companies that have "Co-Founder" title in relationships field (Array)?

A.db.companies.find( { relationships: { $eq: { title: 'Co-Founder' } } } )

B.db.companies.find( { relationships: { $match: { title: 'Co-Founder' } } } )

C.db.companies.find( { relationships: { $elemMatch: { title: 'Co-Founder' } } } )

Question 54

Which cursor method should you use to specify the maximum number of documents returned?

A.cursor.map()

B.cursor.limit()

C.cursor.skip()

D.cursor.hint()

E.cursor.count()

Question 55

What is the built-in database called local in MongoDB for?

A.The local database plays an important role in the authentication and authorization process. Certain actions performed by administrators also require access to this database.

B.The local database is used to store information about shards in shared MongoDB cluster.

C.The local database stores data describing the MongoDB server. For replica sets, it also stores information about the replication process.

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