- A
Use a Basic tier instance and schedule periodic exports to Cloud Storage.
Why wrong: Basic tier has no replication; exports provide durability but not HA (downtime on failure).
- B
Enable persistence using the AOF or RDB configuration in Memorystore.
Why wrong: Memorystore does not support persistent storage; you cannot enable it.
- C
Use a Standard tier instance with cross-zone replication.
Standard tier provides Multi-Zone replication for HA; data is replicated across zones.
- D
Deploy a Redis Cluster across multiple regions using Memorystore.
Why wrong: Memorystore does not support cross-region replication; Redis Cluster is for sharding within a region.
Question 395 of 1,000
PCDOE Manage Database Solutions Practice Question
This PCDOE practice question tests your understanding of manage database solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
You are running a Memorystore for Redis instance with persistence disabled. The application requires high availability and data durability after a zone failure. What is the most cost-effective approach?
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
✓
Use a Standard tier instance with cross-zone replication.
Option C is correct because Standard tier Memorystore for Redis instances provide cross-zone replication by default, ensuring automatic failover and data durability in the event of a zone failure. This meets the high availability and data durability requirements without the need for manual exports or complex multi-region setups, making it the most cost-effective solution.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use a Basic tier instance and schedule periodic exports to Cloud Storage.
Why it's wrong here
Basic tier has no replication; exports provide durability but not HA (downtime on failure).
- ✗
Enable persistence using the AOF or RDB configuration in Memorystore.
Why it's wrong here
Memorystore does not support persistent storage; you cannot enable it.
- ✓
Use a Standard tier instance with cross-zone replication.
Why this is correct
Standard tier provides Multi-Zone replication for HA; data is replicated across zones.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Deploy a Redis Cluster across multiple regions using Memorystore.
Why it's wrong here
Memorystore does not support cross-region replication; Redis Cluster is for sharding within a region.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse data persistence (AOF/RDB) with high availability (cross-zone replication), leading them to choose Option B, which only addresses durability after a crash, not zone failure recovery.
Detailed technical explanation
How to think about this question
Memorystore Standard tier uses synchronous replication to a replica in a different zone within the same region, ensuring that all writes are acknowledged by the replica before confirming to the client. This provides an RPO of effectively zero and an automatic failover typically within seconds, without requiring any application-level changes. In contrast, AOF persistence writes every write operation to an append-only file, which can impact throughput, while RDB snapshots are point-in-time and may lose data between snapshots.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this PCDOE question test?
Manage Database Solutions — This question tests Manage Database Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a Standard tier instance with cross-zone replication. — Option C is correct because Standard tier Memorystore for Redis instances provide cross-zone replication by default, ensuring automatic failover and data durability in the event of a zone failure. This meets the high availability and data durability requirements without the need for manual exports or complex multi-region setups, making it the most cost-effective solution.
What should I do if I get this PCDOE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This PCDOE 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 PCDOE exam.
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