Free MongoDB C100DEV Exam Dumps Questions & Answers

Suppose you have an accounts collection with the following document structure: { _id: ObjectId("61af47c6e29861661d063714"), account_id: 1010, type: 'investment', limit: 1000000 }, { _id: ObjectId("61af47c6e29861661d063715"), account_id: 4336, type: 'derivatives', limit: 100000 }, { _id: ObjectId("61af47c6e29861661d063716"), account_id: 4336, type: 'commodity', limit: 1000 } Which of the following documents would be modified by this update? db.accounts.updateMany( { "type": "investment" }, { "$set": { "limit": 2000000 } } )

• A.  { _id: ObjectId("61af47c6e29861661d063715"), account_id: 4336, type: 'derivatives', limit: 100000 }
• B.  { _id: ObjectId("61af47c6e29861661d063714"), account_id: 1010, type: 'investment', limit: 1000000 }
• C.  { _id: ObjectId("61af47c6e29861661d067825"), account_id: 7355, type: 'commodity', limit: 500000 }
• D.  { _id: ObjectId("61b1bde1ceb6f770f56b0cd9"), account_id: 4915, type: 'investment', limit: 1000000 }

Given a movies collection where each document has the following structure: { _id: ObjectId("573a1390f29313caabcd60e4"), genres: [ 'Short', 'Comedy', 'Drama' ], title: 'The Immigrant', year: 1917, imdb: { rating: 7.8, votes: 4680, id: 8133 }, countries: [ 'USA' ] } Which of the following queries will find all movies that do not contain the Comedy and Romance genres?

• A.  db.movies.find( { genres: { $or: ["Comedy", "Romance"] } } )
• B.  db.movies.find( { genres: { $nin: ["Comedy", "Romance"] } } )
• C.  db.movies.find( { genres: { $in: ["Comedy", "Romance"] } } )

The greater the cardinality of a field, the...

• A.  more useful an index created on this field will be.
• B.  less useful an index created on this field will be.

We have the following index in a movies collection: { title: 1, genres: 1 } We want to insert the following document: { "title": "The Immigrant", "year": 1917, "genres": [ "Short", "Comedy", "Drama" ] } Select proper index entries.

• A.  "The Immigrant", "Short"
• B.  "Short", "The Immigrant"
• C.  "Drama", "The Immigrant"
• D.  "The Immigrant", "Drama"
• E.  "Comedy", "The Immigrant"
• F.  "The Immigrant", "Comedy"
• G.  "The Immigrant", "Short", "Comedy", "Drama"

We have the following index in a movies collection: { title: 1, genres: 1 } We want to insert the following document: { "title": "The Immigrant", "year": 1917, "genres": [ "Short", "Comedy", "Drama" ] } How many index entries will be created?

• A.  2
• B.  4
• C.  1
• D.  0
• E.  3