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1. You have a developers collection with the following document structure: { _id: 1, fname: 'John', lname: 'Smith', tech_stack: ['sql', 'git', 'python', 'linux', 'django', 'aws'] }, { _id: 2, fname: 'Michael', lname: 'Doe', tech_stack: [ 'git', 'python', 'sqlite', 'linux', 'flask' ] } Which of the following queries will return only the first three elements of the array in the tech_stack field?

A) db.developers.find( {}, { tech_stack: { $slice: [0, 3] } } )
B) db.developers.find( { tech_stack: { $slice: [0, 3] } } )
C) db.developers.find( {}, { tech_stack: [0, 1, 2] } )
D) db.developers.find( {}, { tech_stack: [0, 3] } )

2. Select true statements about capped collections.

A) Capped collections guarantee preservation of the insertion order.
B) If the collection is full, the oldest document in the collection is removed when a new document is added to the collection.
C) Capped collections automatically remove the oldest documents in the collection to make room for new documents.
D) Capped collections are fixed-size collections.

3. Suppose you have a reviews collection in your database and you want to optimize the following query: db.reviews.find( { "votes": { "$gt": 100 }, "rating": 4.5 } ).sort( { "date": 1 } ) Which index on this collection will be the most performant for the above query? Keep in mind the equality, sort, range rule.

A) { rating: 1, votes: 1, date: 1 }
B) { date: 1, votes: 1, rating: 1 }
C) { votes: 1, rating: 1, date: 1 }
D) { votes: 1, date: 1, rating: 1 }
E) { date: 1, rating: 1, votes: 1 }
F) { rating: 1, date: 1, votes: 1 }

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

A) Our app needs to retrieve a course and its ten most recent reviews.
B) A course model needs to store references to image of the course that are kept in an external location outside the database.
C) A course model needs to store a counter representing the number of times it was purchased.
D) Our app needs to retrieve a course and information about its instructor.

5. Which of the following commands will delete a collection named restaurants?

A) db.restaurants.delete()
B) db.restaurants.remove()
C) db.restaurants.drop()
D) db.restaurants.dropCollection()

問題與答案：