2024 C100DEV dumps review - Professional Quiz Study Materials [Q63-Q81]

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2024 C100DEV dumps review – Professional Quiz Study Materials

C100DEV Test Prep Training Practice Exam Questions Practice Tests

NO.63 We can use this pattern to work with different schema versions. It mainly involves adding a new field to the document structure, such as schema_version. This field will allow our application to know how to handle particular document. Which pattern does this description apply to?

The Attribute Pattern.

The Schema Versioning Pattern.

The Subset Pattern.

The Polymorphic Pattern.

The Outlier Pattern.

NO.64 Which of the following stages do you need to use to randomly select 10 documents from a specific collection?

{ $rand: { size: 10 } }

{ $sample: { size: 10 } }

{ $sampleRate: { size: 10 } }

{ $sample: { get: 10 } }

NO.65 Select all true statements regarding to unique indexes in MongoDB.

In MongoDB we cannot enforce a unique constraint on compound indexes.

A unique index ensures that the indexed fields don’t store duplicate values.

By default, MongoDB creates a unique index on the _id field.

When creating a unique index, we need to pass an additional unique option set to true. For example:

db.products.createIndex( { manufacturer_id: 1 }, { unique: true } )

NO.66 Why adding indexes may lead to slower write operations?

Because we also need to update the index.

Because we have less and less disk space.

NO.67 What is MongoDB Compass?

Special data type in MongoDB to store geospatial data.

It is a GUI for MongoDB.

A map-based chart type that is available with MongoDB Charts.

NO.68 Where is the MongoDB configuration file usually located?

/var/log/mongod.conf

/tmp/mongod.conf

/home/user/mongod.conf

/bin/mongod.conf

/etc/mongod.conf

NO.69 Select all true statements about the $merge stage.

$merge stage allows us to output the documents to a collection in the same or different database.

$merge stage allows us to output the documents to a sharded collection.

$merge stage must be the last in the pipeline.

NO.70 You have the following replica set configuration: conf = { “_id”: “replset”, “version”: 1, “protocolVersion”: 1, “members”: [ { “_id”: 0, “host”: “192.168.120.24:27017”, “priority”: 2, “votes”: 1 }, { “_id”: 1, “host”: “192.168.120.24:27018”, “priority”: 1, “votes”: 1 }, { “_id”: 2, “host”: “192.168.120.24:27018”, “priority”: 1, “votes”: 1 } ] } Select all true statements about this configuration.

This configuration is incorrect. You can only specify a priority of 0 or 1.

This configuration is incorrect. Host information must be unique for each member in a replica set.

This configuration is incorrect. Replica set cannot have three members.

This configuration is correct.

NO.71 In your database a movies collection is given where each document has the following structure: { _id: ObjectId(“573a1391f29313caabcd9264”), genres: [ ‘Romance’, ‘Drama’ ], title: ‘The Divorcee’, languages: [ ‘English’, ‘French’ ], year: 1930, imdb: { rating: 6.9, votes: 1740, id: 20827 }, countries: [ ‘USA’ ] } Which of the following queries will return all movies that are in the Fantasy and Drama (both) genre?

db.movies.find( { genres: { $elemMatch: [‘Fantasy’, ‘Drama’] } } )

db.movies.find( { genres: { $in: [‘Fantasy’, ‘Drama’] } } )

db.movies.find( { genres: { $size: [‘Fantasy’, ‘Drama’] } } )

db.movies.find( { genres: { $all: [‘Fantasy’, ‘Drama’] } } )

NO.72 Suppose we have a shipwrecks collection with the following document structure: { _id: ObjectId(“578f6fa2df35c7fbdbaed8ce”), feature_type: ‘Wrecks – Visible’, watlev: ‘always dry’, coordinates: [ -79.9469681, 9.3729954 ] } You ran the command below: db.shipwrecks.getIndexes() And you got the following output: [ { v: 2, key: { _id: 1 }, name: ‘_id_’ }, { v: 2, key: { coordinates: ‘2dsphere’ }, name: ‘coordinates_2dsphere’, ‘2dsphereIndexVersion’: 3 } ] How can you remove the geospatial index on the coordinates field?

db.shipwrecks.dropCollection(‘coordinates_2dsphere’)

db.shipwrecks.dropIndex(‘coordinates_2dsphere’)

db.shipwrecks.dropIndex(‘_id_’)

NO.73 Which cursor method should you use to get information about the query plan?

cursor.hint()

cursor.explain()

cursor.map()

NO.74 How to connect to mongod instance and authenticate as root?

mongoroot –authenticationDatabase admin

mongo –username root –password root123 –authenticationDatabase admin

mongo –authenticationDatabase admin

NO.75 What is a MongoDB view?

MongoDB does not support views.

A MongoDB view is a queryable object whose contents are defined by an aggregation pipeline on other collections or views.

It is a different name for collection.

NO.76 Suppose you added the following index to a products collection: { product_category: 1 } Which of the following operations can potentially decrease performance?

db.products.insertOne( { product_category: ‘clothes’ } )

db.products.find( { product_category: ‘clothes’ } )

db.products.updateOne( { product_category: ‘shoes’ }, { $set: company: ‘Nike’ } )

NO.77 There is a gamers collection in your database with the following document structure: { _id: 1, level: 15, is_active: true }, { _id: 2, level: 14, is_active: true }, { _id: 3, level: 7, is_active: false } How do you increase the value of the level field by 20 for a player with id = 3?
Expected result:
{ _id: 1, level: 15, is_active: true }, { _id: 2, level: 14, is_active: true }, { _id: 3, level: 27, is_active: false }

db.gamers.update( { _id: 3 }, { $inc: { level: 20 } } )

db.gamers.update( { _id: 3 }, { $set: { level: 20 } } )

db.gamers.update( { _id: 3 }, { $unset: { level: 20 } } )

NO.78 Does MongoDB support query operations that perform a text search of string content?

Yes

NO.79 Which of the following actions are granted to the built-in userAdmin role?

dropRole

dropCollection

dropUser

grantRole

createRole

createUser

NO.80 Which of the following commands are valid to start a mongod?

mongod –dbpath /data/db –fork

mongod -f /etc/mongod.conf

mongod –logpath /var/log/mongo/mongod.log –dbpath /data/db –fork

mongod –log /var/log/mongo/mongod.log –db /data/db –fork

NO.81 Select all options where you should use sharding.

Your server disks are full, but you can scale up.

You have over 6TB per server and operating costs are increasing dramatically.

Your organization outgrows the most powerful servers available, which limits your vertical scaling capabilities.

Every time you start a new project with MongoDB.

MongoDB C100DEV (MongoDB Certified Developer Associate) Exam is a certification program designed for developers who want to validate their skills and expertise in working with MongoDB, the leading NoSQL database platform. MongoDB Certified Developer Associate Exam certification program is ideal for developers who are looking to demonstrate their proficiency in designing, building, and deploying applications using MongoDB.

Exam Questions Answers Braindumps C100DEV Exam Dumps PDF Questions: https://www.prepawaypdf.com/MongoDB/C100DEV-practice-exam-dumps.html

2024 C100DEV dumps review – Professional Quiz Study Materials [Q63-Q81]

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