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What does the $set operator do in MongoDB?

  • Deletes a field
  • Updates a field
  • Adds a field
  • Queries a field
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Which method is used to aggregate documents in MongoDB?

  • aggregate()
  • group()
  • merge()
  • compile()
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Which command is used to view all collections in a database?

  • view collections
  • get collections
  • show collections
  • list collections
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How do you enable authentication in MongoDB?

  • Start mongod with --auth
  • Start mongod with --enableAuth
  • Start mongod with --authenticate
  • Start mongod with --secure
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Which storage engine is the default in MongoDB?

  • MMAPv1
  • WiredTiger
  • InnoDB
  • RocksDB
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How do you update multiple documents in MongoDB?

  • updateMany()
  • changeMany()
  • updateMultiple()
  • modifyMany()
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Which MongoDB method is used to convert a collection to a capped collection?

  • setCapped()
  • makeCapped()
  • capCollection()
  • convertToCapped()
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How do you create a capped collection in MongoDB?

  • addCappedCollection()
  • createCapped()
  • createCollection() with capped
  • newCappedCollection()
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Which MongoDB method is used to return only specific fields?

  • returnFields()
  • select()
  • projection()
  • fields()
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How do you import data into MongoDB?

  • mongoload
  • mongoimport
  • mongoinput
  • mongoinsert
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What does the MongoDB 'explain' method do?

  • Deletes a document
  • Provides query performance statistics
  • Updates a document
  • Inserts a document
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How do you view the roles of a user in MongoDB?

  • listRoles(<username>)
  • showUserRoles(<username>)
  • show roles for <username>
  • db.getUserRoles(<username>)
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How do you enable text search in MongoDB?

  • create a text index
  • addTextSearch()
  • enableTextSearch()
  • setTextSearch()
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What type of index does MongoDB create by default for the _id field?

  • Compound index
  • Text index
  • Unique index
  • Sparse index
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How do you list all databases in MongoDB?

  • list dbs
  • db.show()
  • db.list()
  • show dbs
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Which command is used to rename a collection in MongoDB?

  • updateCollectionName()
  • renameCollection()
  • changeCollectionName()
  • setCollectionName()
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How do you create a new database in MongoDB?

  • use <database_name>
  • newDatabase <database_name>
  • create <database_name>
  • db.newDatabase(<database_name>)
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What is MongoDB?

  • A programming language
  • A NoSQL database
  • An operating system
  • A SQL database
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What is the purpose of the MongoDB replica set?

  • Provides high availability
  • Simplifies schema design
  • Increases speed
  • Reduces storage
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Which operator is used for a logical AND in MongoDB queries?

  • $or
  • $nor
  • $not
  • $and
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How do you create an index on a field in MongoDB?

  • addIndex()
  • createIndex()
  • indexField()
  • newIndex()
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What does the MongoDB $push operator do?

  • Removes an element from an array
  • Updates an element in an array
  • Adds an element to an array
  • Queries an array
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What is the role of the MongoDB config server?

  • Handles replication
  • Manages user accounts
  • Stores metadata and configuration settings for sharding
  • Backs up data
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Which of the following is NOT a MongoDB shell method?

  • find()
  • insert()
  • update()
  • add()
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How do you back up a MongoDB database?

  • mongosave
  • mongodump
  • mongobackup
  • mongoexport
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What is sharding in MongoDB?

  • Encrypting data
  • Distributing data across multiple machines
  • Compressing data
  • Backing up data
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Which command is used to insert a document in MongoDB?

  • insertDocument()
  • addDocument()
  • insertOne()
  • insertDoc()
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Which of the following is used to update a document in MongoDB?

  • changeOne()
  • updateOne()
  • modifyOne()
  • updateDoc()
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Which command is used to start the MongoDB server?

  • mongod
  • mongo
  • mongodb
  • startmongo
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Which of the following is NOT a MongoDB data type?

  • boolean
  • int32
  • varchar
  • string
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