There is a gamers collection in your database with the following document structure: { _id: 1, level: 15, is_active: true }, { _id: 2, level: 14, is_active: true }, { _id: 3, level: 7, is_active: false } How do you increase the value of the level field by 20 for a player with id = 3?
Expected result:
{ _id: 1, level: 15, is_active: true }, { _id: 2, level: 14, is_active: true }, { _id: 3, level: 27, is_active: false }

• A.db.gamers.update( { _id: 3 }, { $inc: { level: 20 } } )
• B.db.gamers.update( { _id: 3 }, { $set: { level: 20 } } )
• C.db.gamers.update( { _id: 3 }, { $unset: { level: 20 } } )

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Suppose we have a shipwrecks collection with the following document structure: { _id: ObjectId("578f6fa2df35c7fbdbaed8ce"), feature_type: 'Wrecks - Visible', watlev: 'always dry', coordinates: [ -79.9469681, 9.3729954 ] } You ran the command below: db.shipwrecks.getIndexes() And you got the following output: [ { v: 2, key: { _id: 1 }, name: '_id_' }, { v: 2, key: { coordinates: '2dsphere' }, name: 'coordinates_2dsphere', '2dsphereIndexVersion': 3 } ] How can you remove the geospatial index on the coordinates field?

• A.db.shipwrecks.dropCollection('coordinates_2dsphere')
• B.db.shipwrecks.dropIndex('coordinates_2dsphere')
• C.db.shipwrecks.dropIndex('_id_')

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In your database a movies collection is given where each document has the following structure: { _id: ObjectId("573a1391f29313caabcd9264"), genres: [ 'Romance', 'Drama' ], title: 'The Divorcee', languages: [ 'English', 'French' ], year: 1930, imdb: { rating: 6.9, votes: 1740, id: 20827 }, countries: [ 'USA' ] } Which of the following queries will return all movies that are in the Fantasy and Drama (both) genre?

• A.db.movies.find( { genres: { $elemMatch: ['Fantasy', 'Drama'] } } )
• B.db.movies.find( { genres: { $in: ['Fantasy', 'Drama'] } } )
• C.db.movies.find( { genres: { $size: ['Fantasy', 'Drama'] } } )
• D.db.movies.find( { genres: { $all: ['Fantasy', 'Drama'] } } )

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You have the following replica set configuration: conf = { "_id": "replset", "version": 1, "protocolVersion": 1, "members": [ { "_id": 0, "host": "192.168.120.24:27017", "priority": 2, "votes": 1 }, { "_id": 1, "host": "192.168.120.24:27018", "priority": 1, "votes": 1 }, { "_id": 2, "host": "192.168.120.24:27018", "priority": 1, "votes": 1 } ] } Select all true statements about this configuration.

• A.This configuration is incorrect. You can only specify a priority of 0 or 1.
• B.This configuration is incorrect. Host information must be unique for each member in a replica set.
• C.This configuration is incorrect. Replica set cannot have three members.
• D.This configuration is correct.

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Which command do you use to display all indexes in routes collection?

• A.db.routes.indexes()
• B.db.routes.dropIndex()
• C.db.routes.getIndexes()
• D.db.routes.dropIndex()

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