- A
volatile-lru
Why wrong: This evicts only keys with an expiry set, not all keys. The requirement is to evict any key based on LRU.
- B
allkeys-lru
This evicts the least recently used keys from the entire keyspace, which matches the requirement.
- C
volatile-ttl
Why wrong: This evicts keys with the shortest TTL, not necessarily the least recently used.
- D
noeviction
Why wrong: This does not evict any keys; writes will fail when memory is full.
Question 403 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 game development company wants to use Memorystore for Redis as a session store. They need to ensure that when memory is full, the least recently used keys are evicted first. 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:
"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
✓
allkeys-lru
Option B (allkeys-lru) is correct because the requirement is to evict the least recently used keys from the entire keyspace when memory is full. The 'allkeys-lru' policy applies the LRU algorithm to all keys, regardless of whether they have an expiry set, which matches the need to evict the least recently used keys first across the entire dataset.
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
This evicts only keys with an expiry set, not all keys. The requirement is to evict any key based on LRU.
- ✓
allkeys-lru
Why this is correct
This evicts the least recently used keys from the entire keyspace, which matches the requirement.
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
This evicts keys with the shortest TTL, not necessarily the least recently used.
- ✗
noeviction
Why it's wrong here
This does not evict any keys; writes will fail when memory is full.
Common exam traps
Common exam trap: answer the scenario, not the keyword
A common pitfall in Redis eviction policies is confusing 'volatile-lru' (only keys with TTL) with 'allkeys-lru' (all keys). Since the company needs to evict the least recently used keys regardless of expiry, 'allkeys-lru' is correct.
Detailed technical explanation
How to think about this question
Redis implements an approximation of LRU using a sampling approach (configurable via 'maxmemory-samples', default 5) to avoid the overhead of a true LRU linked list. The 'allkeys-lru' policy samples keys from the entire keyspace and evicts the oldest accessed among the sample, which is sufficient for most workloads. In a session store, this ensures that inactive sessions are evicted first, maintaining performance without requiring explicit TTLs on every session key.
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 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 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: allkeys-lru — Option B (allkeys-lru) is correct because the requirement is to evict the least recently used keys from the entire keyspace when memory is full. The 'allkeys-lru' policy applies the LRU algorithm to all keys, regardless of whether they have an expiry set, which matches the need to evict the least recently used keys first across the entire dataset.
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: "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.
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Last reviewed: Jul 4, 2026
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