- A
allkeys-lru
Why wrong: allkeys-lru evicts any key, including those without TTL, which could cause unintended data loss.
- B
noeviction
Why wrong: noeviction returns errors on writes when memory is full, which would break the session store.
- C
volatile-lru
Volatile-lru evicts least recently used keys among those with an expire set. Sessions usually have TTL, so this is the correct policy.
- D
volatile-ttl
Why wrong: volatile-ttl evicts keys with the shortest TTL, not based on recency of use. This might not be ideal for session LRU behavior.
Question 24 of 1,000
PCDOE Manage Database Solutions Practice Question
This PCDOE practice question tests your understanding of manage database solutions. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 have a Memorystore for Redis instance that serves as a session store for a web application. The instance is running low on memory and is approaching the maxmemory limit. You want to ensure that the least recently used keys are evicted first when memory is full. Which eviction policy should you configure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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
✓
volatile-lru
The volatile-lru policy evicts keys with an expire set (TTL) using the LRU algorithm. For a session store, sessions typically have a TTL, so volatile-lru is appropriate. allkeys-lru would evict any key regardless of TTL, which might remove important keys. noeviction would cause write errors when memory is full. volatile-ttl evicts based on TTL, not LRU.
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.
- ✗
allkeys-lru
Why it's wrong here
allkeys-lru evicts any key, including those without TTL, which could cause unintended data loss.
- ✗
noeviction
Why it's wrong here
noeviction returns errors on writes when memory is full, which would break the session store.
- ✓
volatile-lru
Why this is correct
Volatile-lru evicts least recently used keys among those with an expire set. Sessions usually have TTL, so this is the correct policy.
Clue confirmation
The clue words "first", "least" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
volatile-ttl
Why it's wrong here
volatile-ttl evicts keys with the shortest TTL, not based on recency of use. This might not be ideal for session LRU behavior.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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.
- →
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: volatile-lru — The volatile-lru policy evicts keys with an expire set (TTL) using the LRU algorithm. For a session store, sessions typically have a TTL, so volatile-lru is appropriate. allkeys-lru would evict any key regardless of TTL, which might remove important keys. noeviction would cause write errors when memory is full. volatile-ttl evicts based on TTL, not LRU.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first", "least". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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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