- A
Use a Basic tier instance and schedule periodic exports to Cloud Storage.
Why wrong: Basic tier is single-zone only; exports can be used for backup but not automatic failover.
- B
Use a Standard tier instance with replication across zones within the same region.
Standard tier provides multi-AZ replication for high availability.
- C
Enable persistence with RDB snapshots stored in Cloud Storage.
Why wrong: Persistence is not available in Memorystore; you cannot use RDB snapshots.
- D
Create a cross-region replica (read replica in another region).
Why wrong: Memorystore does not support cross-region replicas; it supports cross-zone replicas for Standard tier.
Question 479 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.
Your Memorystore for Redis instance needs to survive a zonal failure with minimal data loss. Which feature should you use?
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 replication across zones within the same region.
Option B is correct because a Standard tier Memorystore for Redis instance with replication across zones provides automatic failover to a replica in a different zone, ensuring high availability and minimal data loss during a zonal failure. The Standard tier uses synchronous replication within the region, so data written to the primary is replicated to the cross-zone replica before acknowledging the write, which minimizes data loss to only in-flight transactions that were not yet committed.
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 is single-zone only; exports can be used for backup but not automatic failover.
- ✓
Use a Standard tier instance with replication across zones within the same region.
Why this is correct
Standard tier provides multi-AZ replication for high availability.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable persistence with RDB snapshots stored in Cloud Storage.
Why it's wrong here
Persistence is not available in Memorystore; you cannot use RDB snapshots.
- ✗
Create a cross-region replica (read replica in another region).
Why it's wrong here
Memorystore does not support cross-region replicas; it supports cross-zone replicas for Standard tier.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that persistence (RDB/AOF) alone provides high availability, but persistence only protects against data loss from restarts, not against zonal failures; you need cross-zone replication (Standard tier) for automatic failover and minimal data loss during a zone outage.
Detailed technical explanation
How to think about this question
Memorystore for Redis Standard tier uses synchronous replication where every write to the primary is replicated to at least one replica in a different zone before the write is acknowledged to the client, ensuring strong consistency and minimal data loss (typically zero committed writes). During a zonal failure, Cloud Memorystore automatically promotes a replica in the surviving zone to primary within seconds, and the DNS endpoint remains unchanged, so applications experience only a brief connection interruption. The replication uses Redis replication protocol (PSYNC) with a replication backlog, and the failover is managed by Google's internal health-check and quorum mechanisms, not by Redis Sentinel or Redis Cluster.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
Visual reference
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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 replication across zones within the same region. — Option B is correct because a Standard tier Memorystore for Redis instance with replication across zones provides automatic failover to a replica in a different zone, ensuring high availability and minimal data loss during a zonal failure. The Standard tier uses synchronous replication within the region, so data written to the primary is replicated to the cross-zone replica before acknowledging the write, which minimizes data loss to only in-flight transactions that were not yet committed.
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.
About these practice questions
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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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