[Nov 21, 2023] Genuine C100DEV Exam Dumps New 2023 MongoDB Pratice Exam
New 2023 Realistic C100DEV Dumps Test Engine Exam Questions in here
NEW QUESTION # 101
Which collection method can you use to build the index?
- A. db.collection.createIndex()
- B. db.collection.getIndexes()
- C. db.collection.insert()
- D. db.collection.create()
Answer: A
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.createIndex/
NEW QUESTION # 102
Which of the following statements are true about the mongo shell? Check all that apply.
- A. You can get a sorted set of documents by using the sort() method.
- B. The mongo shell doesn't return documents in sorted order by default.
- C. Mongo shell is a fully functioning JavaScript interpreter (which means that we can create things like JavaScript variables and functions in mongo shell).
- D. Mongo shell allows us to interact with MongoDB instance without using GUI.
Answer: A,B,C,D
Explanation:
https://docs.mongodb.com/manual/reference/mongo-shell/
NEW QUESTION # 103
Which of the following commands will delete a collection named restaurants?
- A. db.restaurants.dropCollection()
- B. db.restaurants.remove()
- C. db.restaurants.delete()
- D. db.restaurants.drop()
Answer: D
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.drop/
NEW QUESTION # 104
Suppose you have an accounts collection with the following document structure: { _id: ObjectId("61af47c6e29861661d063714"), account_id: 1010, type: 'investment', limit: 1000000 }, { _id: ObjectId("61af47c6e29861661d063715"), account_id: 4336, type: 'derivatives', limit: 100000 }, { _id: ObjectId("61af47c6e29861661d063716"), account_id: 4336, type: 'commodity', limit: 1000 } Which of the following documents would be modified by this update? db.accounts.updateMany( { "type": "investment" }, { "$set": { "limit": 2000000 } } )
- A. { _id: ObjectId("61af47c6e29861661d063715"), account_id: 4336, type: 'derivatives', limit: 100000 }
- B. { _id: ObjectId("61b1bde1ceb6f770f56b0cd9"), account_id: 4915, type: 'investment', limit: 1000000 }
- C. { _id: ObjectId("61af47c6e29861661d067825"), account_id: 7355, type: 'commodity', limit: 500000 }
- D. { _id: ObjectId("61af47c6e29861661d063714"), account_id: 1010, type: 'investment', limit: 1000000 }
Answer: B,D
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.updateMany/
NEW QUESTION # 105
Data modeling. You are considering the use of nesting or references in your data model. Documents can grow rapidly. Which option would be more appropriate?
- A. Use of reference.
- B. Use of nesting.
Answer: A
Explanation:
https://docs.mongodb.com/manual/core/data-modeling-introduction/
NEW QUESTION # 106
You want to execute the following query quite often in your application: db.hotels.aggregate([ { "$match": { "stars": { "$gt": 4.5 } } }, { "$sort": { "stars": 1 } } ]) Your collection doesn't have any additional indexes. Which index should you create to support this query?
- A. db.hotels.createIndex( { "stars": 1 } )
- B. In this case, the index could not be created.
- C. db.hotels.createIndex( { "match": 1 } )
Answer: A
Explanation:
https://docs.mongodb.com/manual/indexes/
NEW QUESTION # 107
Select true statements about sorting & indexing performance.
- A. Index prefixes cannot be used in query predicates to increase index utilization.
- B. Indexes can be traversed both forward and backward.
- C. It's possible to have a sorted query use an index for both sorting and filtering.
- D. Index prefixes can be used in sort predicates to prevent sort in memory.
Answer: B,C,D
Explanation:
https://docs.mongodb.com/manual/tutorial/sort-results-with-indexes/
NEW QUESTION # 108
Select all true statements regarding to scaling.
- A. When scaling horizontally our scaling cost increases linearly.
- B. Scaling horizontally is generally cheaper than scaling vertically.
- C. When scaling vertically our scaling cost increases linearly.
Answer: A,B
Explanation:
https://www.mongodb.com/databases/scaling
NEW QUESTION # 109
Which collection method do you need to use to drop a specific collection?
- A. db.collection.dropCollection()
- B. db.collection.remove()
- C. db.collection.drop()
- D. db.collection.dropIndex()
Answer: C
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.drop/
NEW QUESTION # 110
Use case: e-learning platform Which of the following scenarios is the best candidate to use the Computed Pattern?
- A. A course model needs to store references to image of the course that are kept in an external location outside the database.
- B. A course model needs to store a counter representing the number of times it was purchased.
- C. Our app needs to retrieve a course and its ten most recent reviews.
- D. Our app needs to retrieve a course and information about its instructor.
Answer: B
Explanation:
https://www.mongodb.com/blog/post/building-with-patterns-the-computed-pattern
NEW QUESTION # 111
We have the following index in a movies collection: { title: 1, genres: 1 } We want to insert the following document: { "title": "The Immigrant", "year": 1917, "genres": [ "Short", "Comedy", "Drama" ] } Select proper index entries.
- A. "Drama", "The Immigrant"
- B. "Short", "The Immigrant"
- C. "The Immigrant", "Comedy"
- D. "The Immigrant", "Short"
- E. "The Immigrant", "Drama"
- F. "The Immigrant", "Short", "Comedy", "Drama"
- G. "Comedy", "The Immigrant"
Answer: E
Explanation:
https://docs.mongodb.com/manual/indexes/
NEW QUESTION # 112
Select all true statements about replication in MongoDB.
- A. Replication is also used to prevent downtime in the event of a failure in a data center.
- B. It's a good practice to have replicas in different geographical regions. If one region becomes unavailable due to a major failure in a data center or the network connection to it, the applications will continue to run without downtime.
Answer: A,B
Explanation:
https://docs.mongodb.com/manual/replication/#replication
NEW QUESTION # 113
Select the method that forces MongoDB to use a specific index.
- A. index()
- B. explain()
- C. force()
- D. hint()
Answer: D
Explanation:
https://docs.mongodb.com/manual/reference/method/cursor.hint/
NEW QUESTION # 114
Consider a one-to-one relationship observed between users and the users details. Basic information about application users is separated from detailed information. Which of the following are true about modeling this one-to-one relationship with the document model in MongoDB?
- A. We can embed fields with detailed information as a subdocument in the users collection.
- B. We can link to a single document with detailed information in another collection.
- C. We can embed fields with detailed information in the users collection.
Answer: A,B,C
Explanation:
https://docs.mongodb.com/manual/tutorial/model-embedded-one-to-one-relationships-between-documents/
NEW QUESTION # 115
Select true statements about the selection of the shard key.
- A. High cardinality provides more shard key values, which determines the maximum number of chunks the balancer can create.
- B. Non-monotonic data is a good choice for shard key.
- C. Monotonically changing shard keys result in write operations going to a single shard. This is inefficient.
- D. High frequency - most documents fall within a particular range. This can lead to bottleneck problems within the cluster.
Answer: A,B,C,D
Explanation:
https://docs.mongodb.com/manual/core/sharding-shard-key/
NEW QUESTION # 116
Select all true statements about the differences between mongoexport and mongodump.
- A. mongodump is typically faster than mongoexport
- B. mongoexport outputs JSON file, but mongodump outputs BSON file.
- C. mongodump can create a data file and a metadata file, but mongoexport just creates a data file.
- D. By default, mongodump sends output to stdout, but mongoexport writes to a file.
- E. mongoexport outputs BSON file, but mongodump outputs JSON file.
Answer: A,B,C
Explanation:
https://docs.mongodb.com/database-tools/mongoexport/ https://docs.mongodb.com/database-tools/mongodump/
NEW QUESTION # 117
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 Comedy movies that were made in 2000? (select 2)
- A. db.movies.find( { year: 2000, genres: "Comedy" } )
- B. db.movies.find( { year: 2000 }, { genres: "Comedy" } )
- C. db.movies.find( { $or: [ { year: 2000 }, { genres: "Comedy" } ] } )
- D. db.movies.find( { $and: [ { year: 2000 }, { genres: "Comedy" } ] } )
Answer: A,D
Explanation:
https://docs.mongodb.com/manual/reference/method/db.collection.find/ https://docs.mongodb.com/manual/reference/operator/query/and/
NEW QUESTION # 118
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