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NEW QUESTION 33
Suppose you have a companies collection in your database. Only the following documents are stored in this collection: { _id: ObjectId("52cdef7c4bab8bd675297da4"), name: 'Powerset', category_code: 'search', founded_year: 2006 }, { _id: ObjectId("52cdef7c4bab8bd675297da5"), name: 'Technorati', category_code: 'advertising', founded_year: 2002 }, { _id: ObjectId("52cdef7c4bab8bd675297da7"), name: 'AddThis', category_code: 'advertising', founded_year: 2004 }, { _id: ObjectId("52cdef7c4bab8bd675297da8"), name: 'OpenX', category_code: 'advertising', founded_year: 2008 }, { _id: ObjectId("52cdef7c4bab8bd675297daa"), name: 'Sparter', category_code: 'games_video', founded_year: 2007 }, { _id: ObjectId("52cdef7c4bab8bd675297dac"), name: 'Veoh', category_code: 'games_video', founded_year: 2004 }, { _id: ObjectId("52cdef7c4bab8bd675297dae"), name: 'Thoof', category_code: 'web', founded_year: 2006 } What is the default sort order in the result set returned in response to the following query?

A. descendingB. ascendingC. db.companies.aggregate( [ { "$sortByCount": "$category_code" } ] )

Answer: A

Explanation:
https://docs.mongodb.com/manual/reference/operator/aggregation/sortByCount/

 

NEW QUESTION 34
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. Create the given index: B. There is no way to speed up this query.C. Create the given index:D. db.gamers.createIndex( { level: 1 } )E. Create the given index: F. db.gamers.createIndex( { is_active: 1 } )G. db.gamers.createIndex( { level: 1, is_active: 1 } )

Answer: G

Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.createIndex/

 

NEW QUESTION 35
Select all true statements regarding to the _id field in MongoDB documents. (select 4)

A. The _id can be an array data type.B. MongoDB adds an _id field to any inserted document if it doesn't have one.C. We can select a non ObjectId type value for _id field when inserting a new document.D. When inserting a document, the _id value is already generated as an ObjectId type, if not directly specified.E. The _id values must be unique for the collection.

Answer: B,C,D,E

Explanation:
https://docs.mongodb.com/manual/core/document/ https://docs.mongodb.com/manual/reference/method/ObjectId/

 

NEW QUESTION 36
You have the following index in a movies collection: { "title": 1, "imdb.rating": -1, "imdb.votes": -1, "type": 1 } Can the following query use the given index for both filtering and sorting?
db.movies.find( { "imdb.rating": 8, "title": "James Bond" } ).sort( { "imdb.votes": -1 } )

A. NoB. Yes

Answer: B

Explanation:
Yes, this query can use the index prefix. The order of the fields in the query predicate does not matter. Since both "imdb.rating" and "title" are part of an index prefix, this query can use the index for an equality condition. https://docs.mongodb.com/manual/indexes/

 

NEW QUESTION 37
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