- A
Increase the maxmemory setting to store more data
Why wrong: Increasing maxmemory does not provide durability; data is still lost on failure.
- B
Take regular snapshots of the instance using gcloud commands
Why wrong: Memorystore does not support snapshot commands; snapshots must be done via application logic or using Cloud Storage with export.
- C
Enable Redis persistence (RDB/AOF) on the Memorystore instance
Why wrong: Memorystore does not support Redis persistence persistence; it's a managed service without that option.
- D
Configure a cross-region replica to provide high availability
Cross-region replicas provide failover capability, protecting against zone/regional failures with minimal application changes.
Question 320 of 1,000
PCDOE Manage Database Solutions Practice Question
This PCDOE practice question tests your understanding of manage database solutions. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
A startup uses Memorystore for Redis as a session store. They are concerned about losing session data if the instance fails. Which option provides the best durability for session data without significant application changes?
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
✓
Configure a cross-region replica to provide high availability
Option D is correct because configuring a cross-region replica in Memorystore for Redis provides high availability and durability by replicating data asynchronously to a replica instance in a different region. If the primary instance fails, the replica can be promoted, minimizing session data loss without requiring significant application changes, as the application continues to connect to the same endpoint or a new primary endpoint.
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.
- ✗
Increase the maxmemory setting to store more data
Why it's wrong here
Increasing maxmemory does not provide durability; data is still lost on failure.
- ✗
Take regular snapshots of the instance using gcloud commands
Why it's wrong here
Memorystore does not support snapshot commands; snapshots must be done via application logic or using Cloud Storage with export.
- ✗
Enable Redis persistence (RDB/AOF) on the Memorystore instance
Why it's wrong here
Memorystore does not support Redis persistence persistence; it's a managed service without that option.
- ✓
Configure a cross-region replica to provide high availability
Why this is correct
Cross-region replicas provide failover capability, protecting against zone/regional failures with minimal application changes.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that enabling persistence (RDB/AOF) provides high availability and durability against instance failures, when in reality persistence only protects against data loss on restart and does not provide automatic failover or cross-region resilience.
Trap categories for this question
Command / output trap
Memorystore does not support snapshot commands; snapshots must be done via application logic or using Cloud Storage with export.
Detailed technical explanation
How to think about this question
Memorystore for Redis supports cross-region replication using asynchronous replication, where the primary instance in one region streams write operations to a replica in another region. In the event of a primary failure, you can promote the replica to a new primary, typically with a DNS update or by using a read-only endpoint; however, there is a potential for data loss of a few seconds due to replication lag, which is acceptable for session data that can tolerate eventual consistency. This approach leverages Redis's native replication protocol (REPLCONF ACK) and is distinct from local persistence (RDB/AOF), which only protects against process crashes, not full instance or regional failures.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
- →
Manage Database Solutions — study guide chapter
Learn the concepts, then practise the questions
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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: Configure a cross-region replica to provide high availability — Option D is correct because configuring a cross-region replica in Memorystore for Redis provides high availability and durability by replicating data asynchronously to a replica instance in a different region. If the primary instance fails, the replica can be promoted, minimizing session data loss without requiring significant application changes, as the application continues to connect to the same endpoint or a new primary endpoint.
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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