- A
Use a Basic Tier instance with a large maxmemory setting.
Why wrong: Basic Tier is a single-node instance with no replication or persistence. A large maxmemory setting does not prevent data loss on node failure.
- B
Configure the instance as Standard Tier (with replication) and schedule periodic exports to Cloud Storage.
Why wrong: Standard Tier with replication provides automatic failover, but replication is in-memory only. Periodic exports to Cloud Storage add durability, but data can be lost between export intervals. This does not guarantee zero data loss.
- C
Enable persistence by setting the 'persistence' parameter to 'rdb' in the instance configuration.
Why wrong: RDB persistence creates point-in-time snapshots at configurable intervals, but data written between snapshots is lost on failure. It reduces data loss but not as effectively as AOF.
- D
Enable AOF persistence in the Memorystore instance.
AOF persistence logs every write operation to disk, enabling near-real-time durability. In the event of a node failure, the AOF log can be replayed to recover data with minimal loss. This is the best option for session data that must not be lost.
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 is used as a session store for a web application. You need to ensure that session data is not lost during a node failure. What should you 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
Enable AOF persistence in the Memorystore instance.
Memorystore for Redis supports persistence via RDB snapshotting or AOF (Append-Only File). For minimal data loss during a node failure, AOF persistence is recommended because it logs every write operation, allowing recovery with only a few seconds of data loss (depending on fsync settings). Standard Tier with replication provides high availability but does not persist data to disk, so a full zone failure can cause data loss. Periodic exports to Cloud Storage have gaps between exports, leading to data loss of up to the export interval. Therefore, enabling AOF persistence is the best approach to prevent data loss during a node failure.
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 with a large maxmemory setting.
Why it's wrong here
Basic Tier is a single-node instance with no replication or persistence. A large maxmemory setting does not prevent data loss on node failure.
- ✗
Configure the instance as Standard Tier (with replication) and schedule periodic exports to Cloud Storage.
Why it's wrong here
Standard Tier with replication provides automatic failover, but replication is in-memory only. Periodic exports to Cloud Storage add durability, but data can be lost between export intervals. This does not guarantee zero data loss.
- ✗
Enable persistence by setting the 'persistence' parameter to 'rdb' in the instance configuration.
Why it's wrong here
RDB persistence creates point-in-time snapshots at configurable intervals, but data written between snapshots is lost on failure. It reduces data loss but not as effectively as AOF.
- ✓
Enable AOF persistence in the Memorystore instance.
Why this is correct
AOF persistence logs every write operation to disk, enabling near-real-time durability. In the event of a node failure, the AOF log can be replayed to recover data with minimal loss. This is the best option for session data that must not be lost.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
What to study next
Got this wrong? Here's your next step.
Identify which PCDOE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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: Enable AOF persistence in the Memorystore instance. — Memorystore for Redis supports persistence via RDB snapshotting or AOF (Append-Only File). For minimal data loss during a node failure, AOF persistence is recommended because it logs every write operation, allowing recovery with only a few seconds of data loss (depending on fsync settings). Standard Tier with replication provides high availability but does not persist data to disk, so a full zone failure can cause data loss. Periodic exports to Cloud Storage have gaps between exports, leading to data loss of up to the export interval. Therefore, enabling AOF persistence is the best approach to prevent data loss during a node failure.
What should I do if I get this PCDOE question wrong?
Identify which PCDOE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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
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