Data Engineering Cloud Data Storage Solutions 2

Question 1

Which AWS storage class is most cost-effective for archival data accessed less than once a year with retrieval times of hours?

Accepted Answer

S3 Glacier Deep Archive

Answer

S3 Glacier Deep Archive offers the lowest storage cost for rarely accessed long-term archives.

Question 2

What is the primary benefit of object storage over block storage for a data lake?

Accepted Answer

Massive scalability with rich metadata

Answer

Object storage scales to virtually unlimited capacity and attaches metadata to each object, ideal for data lakes.

Question 3

In Google Cloud Storage, which feature automatically transitions objects between storage classes based on age?

Accepted Answer

Lifecycle Management

Answer

Lifecycle Management applies rules to move or delete objects as they age, optimizing cost.

Question 4

Which storage option is best suited for a high-throughput streaming workload requiring low-latency appends?

Accepted Answer

A managed message/log store like Kafka or Kinesis

Answer

Log-based streaming stores are designed for high-throughput, low-latency append operations.

Question 5

What does 'eventual consistency' mean in a distributed cloud object store?

Accepted Answer

Updates propagate over time and reads may briefly return stale data

Answer

Eventual consistency means replicas converge to the latest value after a propagation delay.

Data Engineering Practice Test