- A
volatile-lru
Why wrong: volatile-lru only evicts keys with TTL set; keys without TTL can fill memory.
- B
volatile-ttl
Why wrong: volatile-ttl evicts keys with TTL set; if most keys have no TTL, memory may fill up.
- C
noeviction
Why wrong: noeviction will cause writes to fail when memory is full, possibly crashing the application.
- D
allkeys-lru
Correct. This evicts the least recently used keys across all keys, ensuring availability.
Question 694 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 Memorystore for Redis instance is running out of memory. The application can tolerate some data loss but not crashes. The team wants to ensure the instance remains available without manual intervention. Which eviction policy should they configure?
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 D (allkeys-lru) is correct because it allows Redis to evict the least recently used keys from the entire keyspace when memory is full, which keeps the instance available without crashing. Since the application can tolerate some data loss but not crashes, this policy ensures memory pressure is relieved automatically, preventing out-of-memory errors that would cause the instance to become unavailable.
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
volatile-lru only evicts keys with TTL set; keys without TTL can fill memory.
- ✗
volatile-ttl
Why it's wrong here
volatile-ttl evicts keys with TTL set; if most keys have no TTL, memory may fill up.
- ✗
noeviction
Why it's wrong here
noeviction will cause writes to fail when memory is full, possibly crashing the application.
- ✓
allkeys-lru
Why this is correct
Correct. This evicts the least recently used keys across all keys, ensuring availability.
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 volatile policies (like volatile-lru or volatile-ttl) are safer because they only affect keys with TTL, but the trap is that if most keys lack expiration, these policies fail to free memory, leading to crashes—whereas allkeys-lru guarantees eviction across all keys to maintain availability.
Detailed technical explanation
How to think about this question
Under the hood, Redis uses an approximation of LRU (not exact LRU) to keep eviction fast, sampling a small pool of keys (default 5) and evicting the oldest among them. In production, allkeys-lru is often preferred for cache-like workloads where data freshness matters, but it can lead to unintended eviction of important keys if the working set is larger than available memory. The maxmemory-policy configuration is set via CONFIG SET or redis.conf, and changes take effect immediately without restart.
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.
- →
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 — Option D (allkeys-lru) is correct because it allows Redis to evict the least recently used keys from the entire keyspace when memory is full, which keeps the instance available without crashing. Since the application can tolerate some data loss but not crashes, this policy ensures memory pressure is relieved automatically, preventing out-of-memory errors that would cause the instance to become unavailable.
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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