MongoDB Online Test

1. 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

2. What is the purpose of the "projection" option in a MongoDB query?

To specify the data to be returned in the result To define the query criteria To set the sort order of results To limit the number of documents returned

3. What is the primary purpose of a "read concern" in MongoDB transactions?

Specifying transaction duration Defining the transaction's read isolation level Enabling multi-document transactions Specifying the write concern level

4. Which MongoDB sharding strategy is suitable for time-series data?

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

5. In which part of the application stack are MongoDB drivers usually implemented?

Presentation layer Application layer Database layer Data storage layer

6. What does ACID stand for in the context of database transactions?

Atomicity, Consistency, Isolation, Durability Advanced Coding Serializable, Integrity, Compliance, Durable All in One Datastore

7. How can you update or maintain MongoDB drivers in an application?

Manually write code Automatically update via package manager Hire a MongoDB developer Use the "MongoDB Driver Manager" tool

8. What does a text index in MongoDB allow you to do?

Index numeric values Index text fields Index binary data Index date values

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

Server version Access control Network interfaces Data encryption

10. What is the purpose of "Global Clusters" in MongoDB Atlas?

Local development Data modeling Data storage optimization High availability and low-latency access

11. 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

12. Which role in MongoDB grants full access to all administrative functions and data?

ReadWrite dbOwner userAdmin clusterAdmin

13. In MongoDB, what does the "$sort" stage do in the aggregation pipeline?

Filters data Sorts documents Groups data Projects data

14. What is the primary purpose of MongoDB replication?

Load balancing High availability Data modeling Data encryption

15. What is GridFS in MongoDB used for?

Data modeling Data storage Data replication Storing large files

16. What is MongoDB Atlas?

An open-source database A cloud-based database service A query language for MongoDB A standalone MongoDB server

17. What is the primary purpose of the "mongos" process in MongoDB?

Managing data backups Managing routing for sharded clusters Managing user authentication Managing replica sets

18. What does it mean to "pre-join" data in MongoDB data modeling?

Combining data during retrieval Separating data into multiple collections Embedding data within a document Storing data in separate databases

19. What is the primary goal of aggregation in MongoDB?

Data retrieval Data encryption Data replication Data transformation

20. How are relationships between entities typically represented in MongoDB data modeling?

Embedding Joining Indexing Normalizing