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MongoDB Certified Developer Associate Exam Sample Questions (Q56-Q61):

NEW QUESTION # 56
Select all true statements about elections (replica set).

  • A. Elections can take place anytime while the primary is available.
  • B. Setting a node's priority to 0 ensures that a node never becomes primary.
  • C. Not all nodes have equal chances to become the primary node.
  • D. Nodes with a higher priority are more likely to be selected as primary node.

Answer: B,C,D Explanation:
https://docs.mongodb.com/manual/replication/#replication-in-mongodb
NEW QUESTION # 57
Select all true statements regarding to $match stage in Aggregation Framework. In your database there is a movies collection with the following document structure: { _id: ObjectId("573a1390f29313caabcd42e8"), genres: [ 'Short', 'Western' ], title: 'The Great Train Robbery', rated: 'TV-G', year: 1903, imdb: { rating: 7.4, votes: 9847, id: 439 }, countries: [ 'USA' ] }, { _id: ObjectId("573a1390f29313caabcd4323"), genres: [ 'Short', 'Drama', 'Fantasy' ], rated: 'UNRATED', title: 'The Land Beyond the Sunset', year: 1912, imdb: { rating: 7.1, votes: 448, id: 488 }, countries: [ 'USA' ] }, { _id: ObjectId("573a1390f29313caabcd446f"), genres: [ 'Short', 'Drama' ], title: 'A Corner in Wheat', rated: 'G', year: 1909, imdb: { rating: 6.6, votes: 1375, id: 832 }, countries: [ 'USA' ] } How can you group these documents to extract all different values for rated field?

  • A. db.movies.aggregate( { $group: { _id: 'rated' } } )
  • B. db.movies.aggregate( { $group: { _id: '$rated' } } )
  • C. db.movies.aggregate( { $group: '$rated' } )

Answer: B Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.aggregate/
NEW QUESTION # 58
Which of the following built-in roles provides the greatest cluster management access?

  • A. clusterManager
  • B. clusterMonitor
  • C. clusterAdmin

Answer: C Explanation:
Explanation: https://docs.mongodb.com/manual/reference/built-in-roles/#mongodb-authrole-clusterAdmin
NEW QUESTION # 59
Select all true statements about reconfiguring a replica set with rs.reconfig().

  • A. When we reconfigure a replica set with rs.reconfig(), we don't need to restart any of the individual nodes.
  • B. When we reconfigure a replica set with rs.reconfig(), we need to update all of the nodes' configuration files.

Answer: A Explanation:
https://docs.mongodb.com/manual/reference/method/rs.reconfig/
NEW QUESTION # 60
Suppose you have a companies collection in your database. Only the following documents are stored in this collection:
{ id: ObjectId("52cdef7c4bab8bd675297da4"), name: 'Powerset', categorycode: 'search', foundedyear: 2006 }, { _id: ObjectId("52cdef7c4bab8bd675297da5"), name: 'Technorati', categorycode: 'advertising', foundedyear: 2002 }, { _id: ObjectId("52cdef7c4bab8bd675297da7"), name: 'AddThis', categorycode: 'advertising', foundedyear: 2004 }, { _id: ObjectId("52cdef7c4bab8bd675297da8"), name: 'OpenX', categorycode: 'advertising', foundedyear: 2008 }, { _id: ObjectId("52cdef7c4bab8bd675297daa"), name: 'Sparter', categorycode: 'gamesvideo', foundedyear: 2007 }, { id: ObjectId("52cdef7c4bab8bd675297dac"), name: 'Veoh', categorycode: 'gamesvideo', foundedyear: 2004 }, { id: ObjectId("52cdef7c4bab8bd675297dae"), name: 'Thoof', categorycode: 'web', foundedyear: 2006 }
How many documents will be deleted when executing the following query?
db.companies.deleteMany( { "category
code": "advertising" } )

  • A. 0
  • B. 1
  • C. 2
  • D. 3

Answer: D Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.deleteMany/
NEW QUESTION # 61
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