Best Preparations of C100DBA Exam 2022 MongoDB Certified DBA Associate Unlimited 123 Questions

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Actionable MongoDB C100DBA Exam Questions

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NEW QUESTION 47
What tool would you use if you want to save a gif file in mongo?

Answer:

Explanation:
mongofile

 

NEW QUESTION 48
Which of the following node is used during election in a replication cluster?

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

Answer: C

 

NEW QUESTION 49
In which of the following scenarios is sharding not the correct option. Select all that apply.

• A. The working set in the collection is expected to grow very large in size
• B. The write operations on the collection are very high
• C. The collection is a read intensive collection with less working set
• D. The write operations on the collection are low

Answer: C,D

 

NEW QUESTION 50
MongoDB is

• A. Object-oriented DBMS
• B. None of the above
• C. Document-oriented DBMS
• D. Relational DBMS

Answer: C

 

NEW QUESTION 51
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. Never
• C. When the many is very large
• D. Always

Answer: A

 

NEW QUESTION 52
What does the following aggregate query perform?

• A. Groups the posts by number of likes (101, 102, 103.) by adding 1 every time
• B. Fetches the posts with likes between 100 and 200 and sets their _id as null
• C. Fetches the posts with likes between 100 and 200, sets the _id of the first document as null and then increments it 1 every time
• D. Calculates the number of posts with likes between 100 and 200

Answer: D

 

NEW QUESTION 53
What is the defau size of a GridFS chunk?

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

Answer: D

 

NEW QUESTION 54
What is the first task that a secondary would perform on being prompted by another secondary for an election?

• A. Vote for the first secondary so that it would become the next primary
• B. Start the election process for primary
• C. Vote for itself and then call for election
• D. Connect to primary to confirm its availability

Answer: D

 

NEW QUESTION 55
What does the following query do when performed on the posts collection? db.posts.update({_id:l},{Title:This is post with ID 1"})

• A. Updates the Title of the post
• B. Replaces the complete document with _id as 1 with the document specified in second parameter
• C. Syntax error
• D. Updating a document is possible only with $set

Answer: B

 

NEW QUESTION 56
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

Answer: A,B

 

NEW QUESTION 57
Which is the default mode in which the explain() command runs?

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

Answer: B

 

NEW QUESTION 58
What tool do you use to see if you have a problem in the consumption of disk I / 0?

Answer:

Explanation:
Mongoperf

 

NEW QUESTION 59
Which command is used to determine storage capacity of specific database?

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

Answer: A

 

NEW QUESTION 60
Which of the following is true about aggregation framework?

• A. Pipeline expressions are stateless except accumulator expressions used with $group operator
• B. A single aggregation framework operator can be used more than once in a query
• C. Each aggregation operator need to return atleast one of more documents as a result
• D. the aggregate command operates on a multiple collection

Answer: A,B,C

 

NEW QUESTION 61
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.
db.sayings.find( { $text : { $search : "fact find" } } )

• A. { _id : 1, quote : "That's a fact, Jack." }
• B. { _id : 3, quote : "Nobody will ever catch me." }
• C. { _id : 2, quote : "Find out if that fact is correct." }

Answer: A,C

 

NEW QUESTION 62
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("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "Pablo" , "aficion" : u
  "flipar"}
• B. { "-id" : Objectld("580a42b5dfblb5al7427d302"), "nombre" : "ruben", "apellido" : "gomez", "aficion" :
  v u "flipar" }
• C. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "Luis", "apellido" : "gomez", "aficion" : u
  "flipar" }
• D. { "_id" : Objectld("580a42acdfblb5al7427d301"), "nombre" : "ruben", "apellido" : "gomez" >

Answer: B,D

 

NEW QUESTION 63
In a sharded cluster, from which node does one stop the balancer process before initiating backup?

• A. mongos node
• B. Any node
• C. replicaset primary node
• D. config server node

Answer: A

 

NEW QUESTION 64
Which of the following operators is used to updated a document partially?

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

Answer: D

 

NEW QUESTION 65
Which of the following statements are true about the $match pipeline operator? Check all that apply.

• A. You should use it early as possible in the pipeline
• B. It has a sintax similar to findQ commands.
• C. It can be used as many time as needed.

Answer: A,B,C

 

NEW QUESTION 66
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

• A. Put indexes on all of your documents
• B. Sharding
• C. The proper storage engine
• D. Properly defined user roles
• E. Replication

Answer: E

 

NEW QUESTION 67
Which format/standard is used by MongoDB internally to store documents?

• A. BSON
• B. JSON - Extended
• C. JSON
• D. B+ Trees

Answer: C

 

NEW QUESTION 68
......

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