PCDE Practice Question: Manage a solution that can span multiple database technologies
A company uses Memorystore for Redis with Standard Tier (replication) and needs to ensure data durability in case of a zone failure. They also need to scale read throughput beyond a single instance. What should they do?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Migrate to Redis Cluster with 3+ shards.
Memorystore for Redis Standard Tier provides cross-zone replication for high availability. To scale read throughput, they can use Redis Cluster (which shards data across multiple shards) or create read replicas. However, Memorystore does not support read replicas for Redis; instead, Redis Cluster provides horizontal scalability and high availability. Upgrading to a larger instance scales vertically but not read throughput horizontally. Persistence is not natively supported in Memorystore.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a cross-region replica and use it for read traffic.
Why it's wrong here
Memorystore does not support cross-region replicas. Cross-region replication is not available.
- ✗
Upgrade to a larger machine type with more memory.
Why it's wrong here
Vertical scaling increases capacity but does not improve read throughput horizontally and does not guarantee zone failure protection beyond Standard Tier.
- ✗
Enable persistence using AOF and configure a backup schedule.
Why it's wrong here
Memorystore does not support native persistence; this is not an option.
- ✓
Migrate to Redis Cluster with 3+ shards.
Why this is correct
Redis Cluster provides horizontal scaling by sharding data, and with multiple shards across zones, it improves both availability and read throughput.
Go deeper
Related to this question
About these practice questions
This PCDE question is part of Courseiva's 1,446-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCDE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCDE exam.