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C100DBA MongoDB Certified DBA Associate (Based on MongoDB 4.4)

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MongoDB · C100DBA

Free C100DBA Exam Dumps Preview

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Question 1

Single choice

Using an arbiter allows one to easily ensure an odd number of voters in replica sets.

Why is this important?

A
To help in disaster recovery
B
To protect agains network partitions
C
To enable certain read preference settings
D
To add greather redundancy
E
For more efficient backup operations

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Correct answerB

Question 2

Single choice

Update If Correct is an approach for which of the following concepts in MongoDB:

A
Concurrency Control
B
Atomicity
C
Performance Management
D
Transaction Management

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Correct answerA

Question 3

Single choice

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

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

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Correct answerD

Question 4

Single choice

You are in a sharded cluster.

What will you do prior to initiating backup in sharded cluster?

A
db.stopBalancer()
B
db.stopserver()
C
sh.stopBalancer()
D
sh.stopserverQ

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Correct answerC

Question 5

Single choice

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)

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Correct answerB

Question 6

Single choice

What is the maximum size of Index Key Limit and Number of Indexes per collection?

A
1024 bytes and 64 indexes
B
12 mega bytes and 64 indexes
C
64 bytes and 1024 indexes
D
1024 bytes and unlimited indexes

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Correct answerA

Question 7

Single choice

JSON stands for

A
JavaScript Object Notation
B
JavaScript Object Naming
C
JavaScript Object Notice
D
None of the above

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Correct answerA

Question 8

Single choice

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

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Correct answerD

Question 9

Single choice

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

A
mongostat
B
mongotop
C
mongorestore
D
mongodump

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Correct answerA

Question 10

Single choice

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

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Correct answerC

Question 11

Single choice

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

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Correct answerB

Question 12

Single choice

What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate
( [ { $group: { _id; "$author", x: { $sum: $likes } } } ] )

A
Average of likes on all the posts of an author, grouped by author
B
Number of posts by an author
C
Sum of likes on all the posts by all the authors
D
Sum of likes on all the posts by an author, grouped by author

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Correct answerD

Question 13

Single choice

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

A
executionStats
B
queryPlanner
C
customExecutionStats
D
allPlansExecution

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Correct answerA

Question 14

Single choice

You perform the following operation in the shell: db.foo.insert( { } );

What gets inserted?

A
A document will be inserted with the same_id as the last document inserted
B
A document that matches the collection's existing schema, but with null fields
C
A document with an_id assigned to be an Objectld
D
An empty document
E
No document will be inserted; an error will be raised

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Correct answerC

Question 15

Single choice

Which of the following about Capped Collections is correct?

A
Fixed Size
B
Only "Fixed Size" and "High-throughput operations that insert and retrieve documents based on insertion order"
C
High-throughput operations that insert and retrieve documents based on insertion order
D
If the allocated space for a capped collection exceeds, it stops inserting new documents

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Correct answerB

Question 16

Fill in the blank

FILL BLANK

Below is a sample document of "orders" collection

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Accepted answer$project

Question 17

Single choice

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

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Correct answerD

Question 18

Multiple choice

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" >

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Correct answersA, D

Question 19

Single choice

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

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

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Correct answerA

Question 20

Single choice

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

A
mongorestore
B
mongostat
C
mongodump
D
mongotop

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Correct answerB

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MongoDB Certified DBA Associate (Based on MongoDB 4.4)

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