DAC Big Data & Cloud Analytics 4

Question 1

What is a common advantage of separating storage from compute in cloud analytics architectures?

Accepted Answer

Each can scale independently to control cost

Answer

Decoupling storage and compute lets each scale independently, optimizing performance and cost.

Question 2

In MapReduce, what is the role of the 'reduce' phase?

Accepted Answer

Aggregate and combine intermediate results by key

Answer

The reduce phase aggregates the intermediate key-value pairs produced by the map phase.

Question 3

Which concept describes ingesting data continuously as it is generated rather than in scheduled batches?

Accepted Answer

Real-time streaming ingestion

Answer

Real-time streaming ingestion processes data continuously as events occur.

Question 4

A data engineer needs sub-millisecond key-based lookups for a caching layer. Which store fits best?

Accepted Answer

Redis (in-memory key-value store)

Answer

Redis is an in-memory key-value store ideal for extremely fast key-based lookups and caching.

Question 5

What is the main benefit of partitioning a large table in a cloud data warehouse?

Accepted Answer

Queries can prune irrelevant partitions to scan less data

Answer

Partitioning lets the engine skip (prune) partitions that don't match the query, reducing data scanned.

Data Analytics Certifications (DAC) Practice Test