- A
volatile-lru
Why wrong: Evicts only keys with TTL set.
- B
volatile-ttl
Why wrong: Evicts keys with shortest TTL.
- C
noeviction
Why wrong: Does not evict; returns errors.
- D
allkeys-lru
Evicts least recently used keys from all keys.
Question 574 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.
A Cloud Memorystore for Redis instance is running out of memory. The team wants to automatically remove the least recently used keys when memory is full. Which eviction policy should they configure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
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
✓
allkeys-lru
The `allkeys-lru` eviction policy is correct because it applies the LRU (Least Recently Used) algorithm to all keys in the Redis instance, not just those with an expiry set. This ensures that when memory is full, the least recently accessed keys are automatically removed, regardless of whether they have a TTL, which directly meets the requirement to free memory without manual intervention.
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.
- ✗
volatile-lru
Why it's wrong here
Evicts only keys with TTL set.
- ✗
volatile-ttl
Why it's wrong here
Evicts keys with shortest TTL.
- ✗
noeviction
Why it's wrong here
Does not evict; returns errors.
- ✓
allkeys-lru
Why this is correct
Evicts least recently used keys from all keys.
Clue confirmation
The clue word "least" in the question point toward this answer.
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 distinction between `volatile-lru` and `allkeys-lru`, trapping candidates who assume LRU only applies to keys with TTLs, when the requirement to remove 'least recently used keys' without qualification implies all keys should be considered.
Detailed technical explanation
How to think about this question
Under the hood, Redis implements LRU by sampling a subset of keys (default 5, configurable via `maxmemory-samples`) and evicting the oldest accessed among them, rather than scanning the entire keyspace, to maintain performance. In a real-world caching scenario, `allkeys-lru` is ideal for a general-purpose cache where all keys are equally eligible for eviction, such as a session store or API response cache, ensuring hot data remains available while cold data is purged.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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: allkeys-lru — The `allkeys-lru` eviction policy is correct because it applies the LRU (Least Recently Used) algorithm to all keys in the Redis instance, not just those with an expiry set. This ensures that when memory is full, the least recently accessed keys are automatically removed, regardless of whether they have a TTL, which directly meets the requirement to free memory without manual intervention.
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.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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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