MongoDB Online Test

1. Which major cloud providers are supported by MongoDB Atlas?

AWS and Azure AWS, Azure, and Google Cloud AWS, Azure, and IBM Cloud AWS, Azure, Google Cloud, and more

2. Which write concern level ensures that data is written to the primary node and at least one secondary node before acknowledging the write operation?

Majority Unacknowledged Acknowledged Writable

3. Which CRUD operation is used to insert a new document into a MongoDB collection?

Create Read Update Delete

4. MongoDB uses a flexible schema. What does this mean?

Data is unstructured Data can have varying structure Data is stored in tables Data is always normalized

5. In SQL databases, how are relationships between data tables typically managed?

Through joins Using nested documents With JSON format By using key-value pairs

6. What is the primary purpose of taking backups in MongoDB?

Data modeling Data storage Data replication Data recovery

7. How can you improve query performance in MongoDB for frequently executed queries?

Use covered queries Execute the query in a loop Increase the collection size Use an index on a non-existent field

8. What does the term "index intersection" refer to in MongoDB?

Combining multiple indexes into one Using a unique index Merging collections Indexing nested documents

9. What is a common requirement for data compliance when it comes to data retention in MongoDB?

Unlimited data retention Minimal data storage Data anonymization Defining data lineage

10. 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

11. Which MongoDB version introduced support for multi-document transactions?

MongoDB 2.4 MongoDB 3.0 MongoDB 4.0 MongoDB 4.2

12. What is the $lookup operator used for in MongoDB Aggregation?

Filtering data Joining data Sorting data Projecting data

13. What is the purpose of the "explain" method in MongoDB?

To execute a query To provide query execution details To create an index To define the schema

14. What does the "bindIp" configuration option control in MongoDB?

Server version Access control Network interfaces Data encryption

15. What is the role of "data masking" in MongoDB's data governance practices?

Data anonymization Data encryption Data modeling Role-based access control

16. What is the preferred method for ensuring high availability of MongoDB when using cloud-based services like MongoDB Atlas?

Use dedicated hardware Implement a single replica set Leverage the cloud provider's features Avoid using cloud-based services

17. What is the role of the "hot storage" engine in MongoDB performance optimization?

Storing cold data Storing frequently accessed data Managing data consistency Query execution

18. In MongoDB, how can you perform a geospatial query to find documents within a specified distance from a point?

$near $geoNear $maxDistance $within

19. What is the primary purpose of transactions in MongoDB?

Data modeling Data storage Data consistency Data encryption

20. MongoDB stores data in collections. What is a collection similar to in relational databases?

Rows Columns Indexes Tables