CDS Architecture & System Design 3

Question 1

Which design principle states that a microservice should own its own database and not share it with other services?

Accepted Answer

Database-per-Service pattern

Answer

The Database-per-Service pattern ensures loose coupling by giving each microservice exclusive ownership of its data store, preventing tight schema dependencies.

Question 2

A data steward is reviewing a proposed architecture where operational and analytical workloads share the same database. What is the PRIMARY risk?

Accepted Answer

OLTP transactions will contend with OLAP queries, degrading performance for both

Answer

Mixing OLTP and OLAP workloads on the same system causes resource contention, where long-running analytical queries block or slow transactional operations.

Question 3

What is 'eventual consistency' in the context of distributed data systems?

Accepted Answer

Given enough time without new updates, all replicas will converge to the same value

Answer

Eventual consistency is a model where replicas may temporarily diverge but are guaranteed to converge to the same state once updates stop propagating.

Question 4

In a data lakehouse architecture, what technology component typically enables ACID transactions on data lake storage?

Accepted Answer

Open table formats such as Apache Iceberg or Delta Lake

Answer

Open table formats like Delta Lake and Apache Iceberg add a transaction log layer over object storage, enabling ACID semantics on data lakes.

Question 5

Which strategy should a data steward recommend when integrating a new system with a legacy application to prevent the new system's domain model from being corrupted by legacy concepts?

Accepted Answer

Anti-Corruption Layer (ACL)

Answer

An Anti-Corruption Layer translates between the legacy system's model and the new system's model, isolating the new domain from legacy concepts.

(CDS) Certified Data Steward Practice Test

(CDS) Certified Data Steward Practice Test

CDS Architecture & System Design 3