MongoDB C100DBA Online Practice Questions and Exam Preparation

MongoDB C100DBA Online Questions & Answers

• Question 71:

  Which of the following commands finds all the documents in the posts collection with post timestamp field as null?

  A. db.posts.find( { post_timestamp: { $fieldtype: null } } )
  B. db.posts.find( { post_timestamp: { $type: null } } )
  C. db.posts.find( { post_timestamp : { $type; 10 > > )
  D. db.posts.find( { post_timestamp: { $fieldtype: 10 } } )
  C. db.posts.find( { post_timestamp : { $type; 10 > > )

• Question 72:

  Which is the correct order (lowest to highest) in which MongoDB compares the BSON types?

  A. Number, Null, String and Object
  B. Null, Number, Object and String
  C. Null, Number, String and Object
  D. String, Null, Number and Object
  C. Null, Number, String and Object

• Question 73:

  What is the on-premise solution having functionality equivalent to cloud manager?

  A. Service Manager
  B. Replica Manager
  C. Ops Manager
  D. Journaling
  C. Ops Manager

• Question 74:

  Which is the default mode in which the explain() command runs?

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

• Question 75:

  What is the maximum size of a MongoDB document?

  A. 2 MB
  B. 12 MB
  C. There is no maximum size. It depends on the RAM.
  D. 16 MB
  D. 16 MB

• Question 76:

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

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

• Question 77:

  Consider the following document from the products collection:

  

  What does the following query using $elemMatch return? db.products.find( { product_code: "345678" }, { variations: { $elemMatch: { size: ^L^ } } } )

  A. Returns the complete document but retrieves only the size field from the array
  B. Returns the document but with only one element in the variations array (corresponding to size L)
  C. Returns the complete document since MongoDB does not support partial array retrieval
  D. Returns the complete document but retrieves only the size field from the array and also with only one element in the variations array (corresponding to size L)
  B. Returns the document but with only one element in the variations array (corresponding to size L)

• Question 78:

  Which node in a replica set does accept write operation?

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

• Question 79:

  Aggregation Pipelines have a limit of:

  A. 2 MB document and 100 MB RAM
  B. 16 MB document and 100 MB RAM
  C. No limit on document and 100 MB RAM
  D. 2 MB document and no limit on RAM
  B. 16 MB document and 100 MB RAM

• Question 80:

  Dada una coleccion, cuales devuelve con la siguiente query db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});

  A. { "-id" : Objectld("580a42b5dfblb5al7427d302"), "nombre" : "ruben", "apellido" : "gomez", "aficion" : v u "flipar" }
  B. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "Luis", "apellido" : "gomez", "aficion" : u "flipar" }
  C. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "Pablo" , "aficion" : u "flipar"}
  D. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "gomez" >
  A. { "-id" : Objectld("580a42b5dfblb5al7427d302"), "nombre" : "ruben", "apellido" : "gomez", "aficion" : v u "flipar" }
  D. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "gomez" >