MongoDB Online Test

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This practice test has 20 questions
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1. What is the MongoDB Atlas "Shared Tier" cluster primarily designed for?

High availability Development and testing Large-scale production Data encryption

2. Which operation is used to remove documents from a collection based on a query criteria?

DeleteOne RemoveOne DropOne EraseOne

3. How does GridFS handle large files that exceed the maximum BSON document size in MongoDB?

Breaks them into smaller chunks Discards the extra data Compresses the data Stores them in a separate collection

4. What is a common practice for securing data at rest in MongoDB?

Use of username and password Encryption of data Frequent data backups Data replication

5. In GridFS, what is the role of the "fs.files" collection?

Storing file metadata Storing file data Storing file chunks Managing document size

6. What is the primary goal of text search in MongoDB?

Sorting documents Searching for specific values Efficiently searching for text Optimizing data storage

7. What is the recommended method to perform aggregations on MongoDB collections?

Using the $group stage Running queries one by one Aggregating data externally Using indexes on collections

8. What is the primary benefit of using aggregation over MapReduce in MongoDB?

Better performance Simplicity and flexibility Support for unstructured data Improved data security

9. In MongoDB, what is the purpose of the "weights" option in text indexes?

Control the indexing process Define the text field Specify the search query Adjust the search relevancy

10. What does the "reduce" function in MapReduce do?

Combine and reduce results Filter documents Sort the data Encrypt data

11. What is a "point-in-time" backup in MongoDB?

A backup of a single document A backup of the entire database A backup that captures data at a specific time A backup of the system configuration

12. In MongoDB, how can you optimize performance when working with large result sets?

Use the "batchSize" option Use the "sort" option Increase the number of documents per batch Use the "count" command

13. What is the purpose of a hidden secondary node in MongoDB replication?

Load balancing Backup data storage Handling read operations Preventing access

14. How can you restore a backup created with "mongodump" in MongoDB?

Use "mongorestore" Manually copy files Use "mongoimport" Re-create the database

15. What is the primary key in MongoDB called?

Primary Key _id Field ObjectId Unique Key

16. Which operation is used to group documents by a specific field in MongoDB Aggregation?

$group $match $project $unwind

17. Which MongoDB feature is used for tracking and recording database activities for auditing and monitoring?

Sharding WiredTiger engine Role-based access control Auditing and logging features

18. What is a recommended strategy for disaster recovery in MongoDB?

Regularly take backups Never back up data Rely on automated failover Use a single MongoDB instance

19. In which industry is MongoDB often employed for handling large volumes of sensor data?

Telecommunications E-commerce Food delivery Video gaming

20. In MongoDB, what is a "write concern" for a transaction?

A way to specify transaction duration A timeout setting A mechanism for enabling multi-document transactions A level of transaction data durability