MongoDB C100DBA Online Practice Questions and Exam Preparation

MongoDB C100DBA Online Questions & Answers

• Question 91:

  Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?

  A. upsert command instead of update command
  B. This has to be handled in application code (Node.js, PHP, JAVA, C#, etc.) and cannot be handled in mongo shell query
  C. {update: true, insert: true} as the third parameter of update command
  D. Specify {upsert : true } as the third parameter of update command
  D. Specify {upsert : true } as the third parameter of update command

• Question 92:

  You perform the following query on the sayings collection, which has the index

  { quote : "text" }:

  Assuming the documents below are in the collection, which ones will the following query return? Check all that apply.

  A. db.sayings.find( { $text : { $search : "fact find" } } )
  B. { _id : 3, quote : "Nobody will ever catch me." }
  C. { _id : 1, quote : "That's a fact, Jack." }
  D. { _id : 2, quote : "Find out if that fact is correct." }
  B. { _id : 3, quote : "Nobody will ever catch me." }
  C. { _id : 1, quote : "That's a fact, Jack." }

• Question 93:

  To add a new user and enable authentication in MongoDB, which of the following steps need be executed?

  A. update users collection and restart mongodb
  B. All of the above
  C. update users collection and restart mongodb with -auth option
  D. update users collection and run db.enableAuthenticationQ
  C. update users collection and restart mongodb with -auth option

• Question 94:

  The________operator can be used to identify an element in the array to be updated without explicitly specifying the position of the element.

  A. $ elemMatch
  B. $slice
  C. Updating an array field without knowing its index is not possible.
  D. $
  D. $

• Question 95:

  In a collection that contains 100 post documents, what does the following command do? db. posts. find().skip(5).limit(5)

  A. Skip and limit nullify each other. Hence returning the first five documents.
  B. Skips the first five documents and returns the next five
  C. Limits the first five documents and then return them in reverse order
  D. Skips the first five documents and returns the sixth document five times
  B. Skips the first five documents and returns the next five

• Question 96:

  What is the output of the following program?

  A. 60 s
  B. 1s
  C. 100 s
  D. 100 ms
  A. 60 s

• Question 97:

  What is the defau size of a GridFS chunk?

  A. 255 K
  B. 1 MB
  C. 16 MB
  D. 2 MB
  A. 255 K

• Question 98:

  In mongodb how do you update a document partially?

  A. $project
  B. $update
  C. $modify
  D. $set
  D. $set

• Question 99:

  Which of the following collections stores authentication credentials in MongoDB?

  A. test.users
  B. local.users
  C. system.users
  D. users.users
  C. system.users

• Question 100:

  Which of the following is a valid insert statement in mongodb? Select all valid.

  A. db.test.push({x:2,y:"apple"})
  B. db.test.insert?quot;";:2,";";";appl";})
  C. db.test.insert({x:2,y:"apple"})
  D. db.test.insert({x:2},{y:"apple"})
  B. db.test.insert?quot;";:2,";";";appl";})
  C. db.test.insert({x:2,y:"apple"})