DEA-C01 Data Store Management Practice Question
A company is using Amazon ElastiCache for Redis to cache frequently accessed data. The cache hit ratio is low, and the engineering team suspects that the eviction policy is causing important data to be removed. Which eviction policy should be used to minimize eviction of the most frequently accessed keys?
⚠ Common exam trap
Test-takers frequently confuse recency (LRU) with frequency (LFU), assuming that 'least recently used' also implies 'least frequently used,' but LRU can evict a frequently accessed key that hasn't been touched recently, which is exactly the problem described.
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-lfu
The allkeys-lfu (Least Frequently Used) eviction policy is the correct choice because it explicitly tracks and retains keys that are accessed most frequently across the entire keyspace. Since the cache hit ratio is low due to eviction of important data, LFU ensures that frequently accessed keys are evicted last, directly addressing the problem of important data being removed.
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
LRU evicts based on recency, not frequency.
- ✓
allkeys-lfu
Why this is correct
LFU evicts least frequently used keys, retaining popular ones.
- ✗
noeviction
Why it's wrong here
When memory is full, writes will fail.
- ✗
volatile-lru
Why it's wrong here
Only evicts keys with TTL set.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DEA-C01 practice question is part of Courseiva's free Amazon Web Services 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 DEA-C01 exam.