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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How to connect to MongoDB with mongod to localhost running on port 27017?

• A.mongo --host 127.0.0.1:27017
• B.mongo --host 127.0.0.1:27000
• C.mongoconnect --host 127.0.0.1:27017

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Given the following example document from an artists collection: { _id: 5, last_name: 'Maurer', first_name: 'Alfred', year_born: 1868, year_died: 1932, nationality: 'USA' } and the following index: db.artists.createIndex( { "last_name": 1, "nationality": 1 } ) How MongoDB will handle the query below?
db.artists.find( { "last_name": /^O./ } )

• A.None of these.
• B.As an index scan.
• C.MongoDB will need to do a collection scan.

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Select all true statements about differences between using aggregate() and find() methods?

• A.find() allows us to compute and reshape data in the cursor.
• B.Any aggregation pipeline can be translated into a find() query.
• C.Any find() query can be translated into an aggregation pipeline.
• D.aggregate() allows us to compute and reshape data in the cursor (like $group, $min and other stages).

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You have the following configuration file: net: bindIp: localhost port: 27000 security: authorization: enabled.
You have to edit this file to use new directory as the dbPath: /var/mongodb/db Select correct Answer .

• A.dbPath: storage: /var/mongodb/db net: bindIp: localhost port: 27000 security: authorization: enabled
• B.storage: dbPath: /data/db net: bindIp: localhost port: 27000 security: authorization: enabled
• C.storage: dbPath: /var/mongodb/db net: bindIp: localhost port: 27000 security: authorization: enabled

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