MongoDB C100DBA Online Practice Questions and Exam Preparation

MongoDB C100DBA Online Questions & Answers

• Question 31:

  Which of the documents below will be retrieved by the following query? Assume the documents are stored in a collection called "sample". Check all that apply.

  db.sample.find( { "$or" : [ { "a" : { "$in" : [ 3, 10] > }, { "b" : { "$lt" : 2 > > ] > )

  A. {''__id" :3, "a": 4, "c" :0, "b" :14}
  B. {''_Jd" :7, "a": 8, "c" :1, "b" :7}
  C. {".Jd" :6, "a": 1, "c" :1, "b" :5}
  D. { ''\Jd" :9, "a": 17, "c": 1, "b": 1}
  E. { \Jd" :10,"a": 3, "c": 1, "b": 1}
  F. {".Jd" :: 2, "a": 2, "c" :: 0, "b": 1}
  G. {".Jd" :: 4, "a": 5, "c" :: 0, "b": 17}
  H. {".Jd" :: 1, "a": 0, "c" :: 0, "b": 2}
  I. {".Jd" :: 5, "a": 3, "c" :: 0, "b": 12}
  J. {".Jd" :: 8, "a": 11, "c": 1, "b": 0}
  D. { ''\Jd" :9, "a": 17, "c": 1, "b": 1}
  E. { \Jd" :10,"a": 3, "c": 1, "b": 1}
  F. {".Jd" :: 2, "a": 2, "c" :: 0, "b": 1}
  I. {".Jd" :: 5, "a": 3, "c" :: 0, "b": 12}
  J. {".Jd" :: 8, "a": 11, "c": 1, "b": 0}

• Question 32:

  Consider the following documents:

  

  You perform the following query;

  

  How many documents will be updated by the query?

  B. 1
  C. 2
  D. 3
  E. 5
  B. 1

• Question 33:

  What tool do you use to see if you have a problem in the consumption of disk I / 0?

  A. Mongoperf
  A. Mongoperf

• Question 34:

  Which command is used to determine storage capacity of specific database?

  A. mongotop
  B. dbstats
  C. mongostat
  D. constats
  B. dbstats

• Question 35:

  By default, the MongoDB cursor in mongo shell is configured to return how many documents? To get the next set of documents, which command is used?

  A. 200, more
  B. No limit, none
  C. 20, it
  D. 50, it
  C. 20, it

• Question 36:

  Which features of relational database management systems were deliberately omitted in MongoDB and help us to obtain horizontal scalability? Check all that apply.

  A. Multi-statement transactions
  B. Joins
  C. Authentication
  A. Multi-statement transactions
  B. Joins

• Question 37:

  When should we consider representing a one-to-many relationship in an embedded collection instead of separate collection?

  A. When the many is not very large
  B. When the many is very large
  C. Always
  D. Never
  A. When the many is not very large

• Question 38:

  What tool do you use if you want to extract a CSV from mongo?

  A. mongoexport
  A. mongoexport

• Question 39:

  The MongoDB explain() method does not support which of the following verbosity mode:

  A. executionStats
  B. queryPlanner
  C. customExecutionStats
  D. allPlansExecution
  A. executionStats

• Question 40:

  Which of the following operators is used to updated a document partially?

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