C100DEV Exam Info and Free Practice Test All-in-One Exam Guide Jul-2023 [Q51-Q67]

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C100DEV Exam Info and Free Practice Test All-in-One Exam Guide Jul-2023

Pass MongoDB C100DEV Actual Free Exam Q&As Updated Dump Jul 21, 2023

NEW QUESTION 51
Select read concern levels that are supported by transactions in MongoDB.

local

majority

snapshot

https://docs.mongodb.com/manual/core/transactions/#read-concern-write-concern-read-preference

NEW QUESTION 52
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 } }

https://docs.mongodb.com/manual/reference/operator/aggregation/sample/

NEW QUESTION 53
We have a movies collection with the following document structure: { _id: ObjectId(“573a1390f29313caabcd6223”), genres: [ ‘Comedy’, ‘Drama’, ‘Family’ ], title: ‘The Poor Little Rich Girl’, released: ISODate(“1917-03-05T00:00:00.000Z”), year: 1917, imdb: { rating: 6.9, votes: 884, id: 8443 } } We need to extract all movies from this collection where genres does not include ‘Romance’. Which query should we use?

db.movies.find( { genres: { $nin: [‘Romance’] } } )

db.movies.find( { genres: { $or: [‘Romance’] } } )

db.movies.find( { genres: { $and: [‘Romance’] } } )

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

https://docs.mongodb.com/manual/reference/operator/query/nin/

NEW QUESTION 54
How to shutdown the server? (Mongo shell)

use admin

db.shutdown()

use admin

db.shutdownServer()

use admin

db.disconnect()

https://docs.mongodb.com/manual/reference/method/db.shutdownServer/

NEW QUESTION 55
How to correctly create a date (new object of Date type) in MongoDB?

db.Date()

new Date()

Date()

https://docs.mongodb.com/manual/reference/method/Date/

NEW QUESTION 56
In which situations can we consider sharding?

We want to improve read performance for our application.

It takes too long to backup and restore the data set.

A new developer will join your development team soon.

Our dataset is too big to fit in one MongoDB instance.

https://docs.mongodb.com/manual/sharding/

NEW QUESTION 57
Which of the following constraints might impact your data model for MongoDB?

Security & Compliance

RAM

Network

Operating System

https://docs.mongodb.com/manual/core/data-modeling-introduction/

NEW QUESTION 58
Given a movies collection where each document has the following structure: { _id: ObjectId(‘573a1390f29313caabcd60e4’), genres: [ ‘Short’, ‘Comedy’, ‘Drama’ ], title: ‘The Immigrant’, year: 1917, imdb: { rating: 7.8, votes: 4680, id: 8133 }, countries: [ ‘USA’ ] } Which of the following queries will find all movies that were made in 2000 or 2010?

db.movies.find( { $or: [ { year: 2000 }, { year: 2010 } ] } )

db.movies.find( { year: 2000, year: 2010 } )

db.movies.find( { $and: [ { year: 2000 }, { year: 2010 } ] } )

db.movies.find( { $in: [ { year: 2000 }, { year: 2010 } ] } )

https://docs.mongodb.com/manual/reference/method/db.collection.find/ https://docs.mongodb.com/manual/reference/operator/query/or/

NEW QUESTION 59
Can you create a unique index in MongoDB?

Yes

https://docs.mongodb.com/manual/core/index-unique/

NEW QUESTION 60
Suppose you have a mobile_games collection with the following document structure to redesign: { game: “Fishing Clash”, company: “Ten Square Games”, platforms: [‘Android’, ‘IOS’], … release_USA: ISODate(“2017-04-09T01:00:00+01:00”), release_France: ISODate(“2017-04-09T01:00:00+01:00”), release_Italy: ISODate(“2017-08-17T01:00:00+01:00”), … } Which pattern solution is best suited for this situation?

The Subset Pattern.

There is no need to redesign the document structure.

The Bucket Pattern.

The Extended Reference Pattern.

The Attribute Pattern.

https://www.mongodb.com/blog/post/building-with-patterns-the-attribute-pattern

NEW QUESTION 61
Select true statements about shard keys.

Shard keys are used to organize documents into chunks and shards, and mongos can use this to route queries.

Shard keys can include the _id field, but they don’t have to.

All shard keys must be supported by an index with the same document fields.

https://docs.mongodb.com/manual/core/sharding-shard-key/

NEW QUESTION 62
Select all true statements regarding to schema validation in MongoDB.

Validation rules are on a per-collection basis.

MongoDB doesn’t provide the capability to perform schema validation during updates and insertions.

We need to use db.createCollection() with the validator option to specify validation rules for a new collection.

https://docs.mongodb.com/manual/core/schema-validation/

NEW QUESTION 63
In your database there is a movies collection with the following document structure: { _id: ObjectId(“573a1390f29313caabcd42e8”), genres: [ ‘Short’, ‘Western’ ], title: ‘The Great Train Robbery’, rated: ‘TV-G’, year: 1903, imdb: { rating: 7.4, votes: 9847, id: 439 }, countries: [ ‘USA’ ] }, { _id: ObjectId(“573a1390f29313caabcd4323”), genres: [ ‘Short’, ‘Drama’, ‘Fantasy’ ], rated: ‘UNRATED’, title: ‘The Land Beyond the Sunset’, year: 1912, imdb: { rating: 7.1, votes: 448, id: 488 }, countries: [ ‘USA’ ] }, { _id: ObjectId(“573a1390f29313caabcd446f”), genres: [ ‘Short’, ‘Drama’ ], title: ‘A Corner in Wheat’, rated: ‘G’, year: 1909, imdb: { rating: 6.6, votes: 1375, id: 832 }, countries: [ ‘USA’ ] } How can you group these documents to extract the distribution of rated field?

db.movies.aggregate( { $group: { _id: ‘$rated’, $count: { $sum: 1 } } } )

db.movies.aggregate( { $group: { _id: ‘$rated’, count: { $sum: 1 } } } )

db.movies.aggregate( { $group: { _id: ‘$rated’, count: { $avg: 1 } } } )

db.movies.aggregate( { $group: { _id: ‘rated’, count: { $sum: 1 } } } )

https://docs.mongodb.com/manual/reference/method/db.collection.aggregate/

NEW QUESTION 64
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.

https://docs.mongodb.com/manual/replication/#replication

NEW QUESTION 65
MongoDB can benefit from adding more RAM to your servers.

Yes

NEW QUESTION 66
Select all true statements about indexes on a field with values of varying data types.

Values are ordered only by data type.

In MongoDB index cannot have different data types.

Values are ordered only by value.

Values are ordered by data type, then by value.

https://docs.mongodb.com/manual/indexes/

NEW QUESTION 67
What can you deduce from the explain() method?
For example:
db.collection.find().explain()

All stages that the query must go through with details about the time it takes, number of documents processed and returned to the next stage in the pipeline.

All available indexes for this collection.

The index used by the chosen plan.

Whether the sort stage was performed by index or performed in memory.

https://docs.mongodb.com/manual/reference/method/cursor.explain/

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The MongoDB C100DEV exam covers a wide range of topics, including database design, data modeling, data aggregation, indexing, and querying. It also covers advanced topics such as sharding, replication, and security. C100DEV exam is designed to test the practical skills of developers in working with MongoDB and requires candidates to demonstrate their ability to design, develop, and deploy MongoDB-based applications. Passing the C100DEV exam is an important milestone for developers who want to demonstrate their skills and expertise in using MongoDB to develop high-performance applications. MongoDB Certified Developer Associate Exam certification provides a valuable credential that can help developers advance their career and pursue new opportunities in the field of database development.

Online Questions – Valid Practice C100DEV Exam Dumps Test Questions: https://www.prepawaytest.com/MongoDB/C100DEV-practice-exam-dumps.html

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