MongoDB C100DBA Online Practice Questions and Exam Preparation

MongoDB C100DBA Online Questions & Answers

• Question 81:

  Which operations add new documents to a collection?

  A. Create
  B. update
  C. insert
  D. delete
  A. Create
  C. insert

• Question 82:

  Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

  

  A. db.posts.createIndex({commerits.$.author":-l});
  B. db.posts.createIndex({comments.$.author": {$desc:l>});
  C. db.posts.createIndex({comments.author":-l});
  C. db.posts.createIndex({comments.author":-l});

• Question 83:

  Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?

  A. netLatency
  B. secondaryPreferred
  C. nearest
  D. primaryPreferred
  C. nearest

• Question 84:

  In a replicated cluster, which of the following node would only be used during an election?

  A. arbiter
  B. primary
  C. hidden
  D. secondary
  A. arbiter

• Question 85:

  Which of the following are common uses of the mongo shell? Check all that apply

  A. Perform queries against MongoDB collections
  B. Perform administrative tasks
  C. Use as a JavaScript framework for your production system
  A. Perform queries against MongoDB collections
  B. Perform administrative tasks

• Question 86:

  What is the equivalent command in MongoDB for the following SQL query? SELECT * FROM posts WHERE author like "%john%"

  A. db.posts.find( { author: /John/ } )
  B. db.posts.find( { author: /AjohnA/ > )
  C. db.posts.find( { $like: {author: /John/} } )
  D. db.posts.find( { author: {$like: /John/} } )
  A. db.posts.find( { author: /John/ } )

• Question 87:

  Which are the ONLY ways to project portions of an array?

  A. $slice
  B. $
  C. All of the above
  D. $ elemMatch
  C. All of the above

• Question 88:

  Which mongodb tools allow us to work with our data in a human readable format?

  A. mongoexport
  B. mongostat
  C. mongoimport
  D. mongodump
  A. mongoexport
  C. mongoimport

• Question 89:

  Which of the following are valid json documents? Select all that apply.

  A. {"a":l, "b":{"b":l, "c":"foo", "d":"bar", "e":[l,2,4]}}
  B. {"city":"New York", "population", 7999034, boros:{"queens", "manhattan", "staten island", "the bronx", u "brooklyn"}}
  C. {"name":"Fred Flintstone";"occupation":"Miner";"wife":"Wilma"}
  D. { }
  A. {"a":l, "b":{"b":l, "c":"foo", "d":"bar", "e":[l,2,4]}}
  D. { }

• Question 90:

  Which mongodb tool is used to report details on number of database operations in MongoDB?

  A. mongostat
  B. mongotop
  C. mongorestore
  D. mongodump
  A. mongostat