Discover MongoDB quiz

Test your knowledge path progress

Test your MongoDB knowledge and skills and you'll be able to quickly assess how well you've mastered key information and coding techniques you've learned from this knowledge path.

Andrew Glover, CTO, App47

Andrew GloverAndrew Glover is a developer, author, speaker, and entrepreneur with a passion for behavior-driven development, Continuous Integration, and Agile software development. He is the founder of the easyb Behavior-Driven Development (BDD) framework and is the co-author of three books: Continuous Integration, Groovy in Action, and Java Testing Patterns. You can keep up with him at his blog and by following him on Twitter.



04 December 2012

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These exercises and solutions supplement the developerWorks knowledge path "Discover MongoDB."

  1. MongoDB supports query joins between collections.
    1. True
    2. False
  2. Replica sets in MongoDB offer the following benefits (pick all that apply):
    1. Data redundancy
    2. Distributed transaction support
    3. Automated failover & high availability
    4. Disaster recovery
  3. In replica sets, all write requests are automatically sent to secondary nodes directly.
    1. True
    2. False
  4. MongoDB documents are represented as XML.
    1. True
    2. False
  5. Fix this query:
    db.words.find({}).orderBy({spelling:1})
  6. Fix this query:
    db.words.find({}).sort({spelling:1}).rows(3)
  7. Searching for elements in a document array requires you specify a positional element (i.e. document.arrary[i]).
    1. True
    2. False
  8. MongoDB enforces attribute similarity across documents in a collection (i.e. all word documents must have an array of synonyms).
    1. True
    2. False
  9. To find all documents that do not contain the attribute 'synonyms' this query will work.
    db.words.find({synonyms:{$exist:false}})
    1. True
    2. False
  10. In Mongo, frequently accessed data is stored:
    1. On disk
    2. In memory
  11. MongoDB supports indexes just like any other relational database.
    1. True
    2. False
  12. Indexes can make document queries faster but:
    1. They can make inserts and updates slightly slower
    2. Require specialized query commands to even be leveraged (in other words, hints)
    3. They do not work in a replica set environment

Answers

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