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MongoDB Online Skill Assessment Test

Topics Covered

  • Query Sample
  • MongoDB Facts
  • Denormalized Data Models
  • TTL Feature
  • New Data Creation
  • Query Retrieval
  • New Data Creation
  • Select statement in Mongo

Useful for hiring

  • MongoDB Developer
  • MongoDB expert
  • Full stack Web developer

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Question

Fix this query:
db.words.find({}).sort({spelling:1}).rows(3)

Answer
    • db.words.find({}).sort({spelling:1}).top(3)

    • db.words.find({}).sort({spelling:1}).limit(3)

    • db.words.find({}).sort({spelling:1}).find(3)

Question

Indexes can make document queries faster but:

Answer
    • They can make inserts and updates slightly slower

    • Require specialized query commands to even be leveraged (in other words, hints)

    • They do not work in a replica set environment

Question

Fix this query:
db.words.find({}).orderBy({spelling:1})

Answer
    • db.words.find({}).sortBy({spelling:1})

    • db.words.find({}).sort({spelling:1})

    • db.words.orderBy({spelling:1}).find({})

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