MongoDB Online Test

1. What is the purpose of the "Live Migration" feature in MongoDB Atlas?

Data modeling Data storage optimization Migrating data from on-premises to the cloud Real-time data analysis

2. In the MongoDB Aggregation Framework, what does the $unwind operator do?

Filters documents Transforms data Splits array fields Groups documents

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

Create Read Update Delete

4. What is the purpose of a MongoDB driver in an application?

Data storage Query execution Handling user authentication Implementing data modeling

5. Which operator is used to perform text searches in MongoDB?

$search $text $find $query

6. What is the purpose of authorization in MongoDB?

Encrypting data Managing data replication Managing data modeling Controlling access

7. How does MongoDB driver authentication typically work?

By using a shared key Through SSL/TLS encryption With a username and password By matching document IDs

8. What is the MongoDB method used to start a new session for a transaction?

db.startSession() db.beginTransaction() db.createTransaction() db.newSession()

9. Which MongoDB feature allows you to control access and permissions to data within the database?

Data masking Role-based access control Data lineage Data compliance policies

10. Which stage in the MongoDB aggregation pipeline is used to reshape documents and calculate expressions?

$project $match $sort $group

11. How is data distributed across multiple shards in MongoDB?

By distributing documents evenly across shards By replicating data on all shards By partitioning data based on the _id field By randomly assigning data to shards

12. Which shard key strategy in MongoDB ensures that data is evenly distributed across shards?

Hashed Shard Key Range-based Shard Key Dynamic Shard Key Static Shard Key

13. What is the primary purpose of the MongoDB Aggregation Framework?

Data retrieval Data storage Data insertion Data modeling

14. In the context of data governance, what does "data lineage" refer to in MongoDB?

Data security Data provenance Data encryption Data modeling

15. What does the "data pruning" process typically involve in MongoDB maintenance?

Reducing data size Increasing query complexity Monitoring database statistics Data anonymization

16. What is the recommended approach to optimize query performance in MongoDB?

Avoid indexing Use compound indexes Use a single field index Store data in separate collections

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

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

18. What is the role of the "dbPath" setting in MongoDB configuration?

Specifies the port number Specifies the data directory path Sets the maximum connections Configures user authentication

19. What is the recommended strategy for ensuring high availability in MongoDB?

Single replica set Sharding Use multiple standalone servers Replica sets and sharding

20. 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