Free Access MongoDB.C100DEV.v2025-04-24.q83 Practice Test (Page 10)

Question 41

Select all true statements regarding to unique indexes in MongoDB.

A.In MongoDB we cannot enforce a unique constraint on compound indexes.

B.A unique index ensures that the indexed fields don't store duplicate values.

C.By default, MongoDB creates a unique index on the _id field.

D.When creating a unique index, we need to pass an additional unique option set to true. For example:

E.db.products.createIndex( { manufacturer_id: 1 }, { unique: true } )

Question 42

Select all true statements regarding to duplicate documents in MongoDB.

A.MongoDB can store duplicate documents in the same collection, as long as their _id values are different.

B.MongoDB can store duplicate documents in the same collection (with the same _id value).

Question 43

We have an accounts collection with the following document structure: { _id: ObjectId("5ca4bbc7a2dd94ee5816239d"), account_id: 864905, limit: 10000, products: [ 'Commodity', 'InvestmentStock' ] }, { _id: ObjectId("5ca4bbc7a2dd94ee5816239e"), account_id: 299072, limit: 10000, products: [ 'InvestmentFund', 'InvestmentStock' ] }, { _id: ObjectId("5ca4bbc7a2dd94ee5816239f"), account_id: 137994, limit: 10000, products: [ 'CurrencyService', 'InvestmentStock' ] } We need to use Aggregation Framework to find the distribution of products field. Sort the result set by decreasing total number of products. Expected output: [ { _id: 'InvestmentStock', total: 1746 }, { _id: 'CurrencyService', total: 742 }, { _id: 'Brokerage', total: 741 }, { _id: 'InvestmentFund', total: 728 }, { _id: 'Commodity', total: 720 }, { _id: 'Derivatives', total: 706 } ] Which pipeline should you use?

A.[{ $unwind: { path: "$products" } }, { $group: { _id: "$products", total: { $sum: 1 } } }, { $sort: { total: -1 } }]

B.[{ $group: { _id: "$products", total: { $sum: 1 } } }, { $sort: { total: -1 } }]

C.[{ $unwind: { path: "products" } }, { $group: { _id: "products", total: { $sum: 1 } } }, { $sort: { total: -1 } }]

Question 44

Select all true statements regarding to the insert operation.

A.If you insert a document with no _id value specified, it will result in a write error.

B.If you insert document with a _id field value that already exists, an error will be raised.

C.MongoDB will automatically add an _id field when inserting document without specified _id field into a collection.

Question 45

Suppose you are connected to mongod instance that is already running on port 27000 as admin user. You have to export reviews collection from the restaurants database to JSON file named reviews.json. Which command should you use?

A.mongoexport --db restaurants --collection reviews -o reviews.json

B.mongodump --db restaurants --collection reviews -o reviews.json

C.mongoexport --db restaurants --collection reviews -o export.json

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Question 41

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Question 43

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Question 45

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