2023 PassLeaderVCE MongoDB C100DBA Dumps and Exam Test Engine [Q61-Q84]

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2023 PassLeaderVCE MongoDB C100DBA Dumps and Exam Test Engine

MongoDB C100DBA DUMPS WITH REAL EXAM QUESTIONS

QUESTION 61
Which of the following aggregate commands in MongoDB uses a pipeline approach with the goals of improving the aggregation performance?

mapReduce

group

aggregate

All of the above

QUESTION 62
Below is a sample document of “orders” collection

$project

QUESTION 63
Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?

netLatency

secondaryPreferred

nearest

primaryPreferred

QUESTION 64
Which of the following operator can be used to control the number of items of an array that a query returns?

$ elemMatch

$slice

MongoDB does not support partial retrieval of items from an array

QUESTION 65
Which of the following operator can be used to limit the number of documents in an array field of a document after an update is performed?

$arrayLimit

$push along with $each, $sort and $slice

$removeFromSet

None of the above

QUESTION 66
You are in a sharded cluster. What will you do prior to initiating backup in sharded cluster?

db.stopBalancer()

db.stopserver()

sh.stopBalancer()

sh.stopserverQ

QUESTION 67
Which of the following commands will return all the posts with number of likes greater than 100 and less than
200, both inclusive?

db.posts.find({ likes : { $gte : 100 , $lte : 200 } } );

db.posts.find({ likes : { $gt : 100 , $lte : 200 } } );

db.posts.find({ likes : { $gte : 100, $lt : 200 } } );

db.posts.find({ likes : { $gt : 100, $lt : 200 > > );

QUESTION 68
Which of the following is correct about MongoDB?

MongoDB supports geospatial indexes

MongoDB supports some of the SQL functions

MongoDB uses JSON format to represent documents

MongoDB supports collection joins

QUESTION 69
Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

db.population.aggregate( [{ $group: { _id: { state: “$state”, city; “$city” },pop: { $sum: 1 > > >] )

db.population.aggregate( [{ $group: { _id: { state: Estate”, city: “$city” },pop: { $pop: 1 } } }] )

db.population.aggregate( [{ $group: { _id: { state: Estate”, city: n$city” },pop: { $sum: “$pop” } } }] )

db.population.aggregate( [{ $group: { _id: { city: “$city” },pop: { $sum: “$pop” } } }] )Multi Document Transaction is not supported by MongoDB

QUESTION 70
Which of the following about Capped Collections is correct?

Fixed Size

Only “Fixed Size” and “High-throughput operations that insert and retrieve documents based on insertion order”

High-throughput operations that insert and retrieve documents based on insertion order

If the allocated space for a capped collection exceeds, it stops inserting new documents

QUESTION 71
What does the following $slice query return using the following command? db.posts.find( {}, { comments: {
$slice: [ -10, 5 ] } } )

Returns 5 comments, beginning with the last 10 items

Returns 10 comments, beginning with the last

Returns 10 comments, beginning with the first

Returns 5 comments, beginning with the first 10 items

QUESTION 72
Which of the following commands can cause the database to be locked?

All of the above

Inserting data

Map-reduce

Issuing a query

QUESTION 73
Which node in a replica set does accept write operation?

arbiter

hidden

primary

secondary

QUESTION 74
Which of the following commands finds all the documents in the posts collection with post timestamp field as null?

db.posts.find( { post_timestamp: { $fieldtype: null } } )

db.posts.find( { post_timestamp: { $type: null } } )

db.posts.find( { post_timestamp : { $type; 10 > > )

db.posts.find( { post_timestamp: { $fieldtype: 10 } } )

QUESTION 75
Which of the following command inside aggregate command is used in MongoDB aggregation to filter the documents to pass only the documents that match the specified condition(s) to the next pipeline stage.

$aggregate

$sum

$match

$group

QUESTION 76
Which of the following is incorrect statement about find and findOne operations in MongoDB?

findQ returns all the documents in a collection while findOne() retrieves only the first one.

find.limit(l) is not the same query as findOne()

findOneQ returns the actual first document retrieved from a collection

findQ and findOneQ returns cursors to the collection documents

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^ } } } )

Returns the complete document but retrieves only the size field from the array

Returns the document but with only one element in the variations array (corresponding to size L)

Returns the complete document since MongoDB does not support partial array retrieval

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)

QUESTION 78
Update If Correct is an approach for which of the following concepts in MongoDB:

Concurrency Control

Atomicity

Performance Management

Transaction Management

QUESTION 79
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

Sharding

Properly defined user roles

Replication

Put indexes on all of your documents

The proper storage engine

QUESTION 80
To add a new user and enable authentication in MongoDB, which of the following steps need be executed?

update users collection and restart mongodb

All of the above

update users collection and restart mongodb with -auth option

update users collection and run db.enableAuthenticationQ

QUESTION 81
Which of the following is supported by MongoDB?

Transaction Management

ACID Transactions

Journaling

Relationships between Collections (Primary Key Foreign Key)

QUESTION 82
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?

200, more

No limit, none

20, it

50, it

QUESTION 83
You have a replicated cluster with 1 primary, 3 secondary, 1 arbiter. One of the secondary is hidden. What is the replication factor of this replicated cluster?

QUESTION 84
In a replica set, a_________number of members ensures that the replica set is always able to select a primary.

Even

Odd

Depends on the application architecture

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To prepare for the MongoDB C100DBA certification exam, candidates can take advantage of various resources, including official MongoDB documentation, online courses, and practice tests. These resources provide candidates with the knowledge and skills needed to pass the exam and become a MongoDB Certified DBA Associate.

What are the questions asked in MongoDB C100DBA Exam

The questions are to be answered using Write, Flush, Recover, and Update policies for MongoDB. Command-line interface tools are used to administer, install, configure, monitor, secure, and troubleshoot MongoDB. Dumps offered by MongoDB C100DBA certification exam help people to improve their weaknesses in this entry-level certification exam.

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