Question 856 of 1,663
DBS-C01 Monitoring and Troubleshooting Practice Question
A company is using Amazon ElastiCache for Redis as a caching layer for a web application. The application team reports that cache miss rates have increased significantly, causing higher database load. The Redis cluster has two nodes (one primary, one replica) with the default eviction policy of noeviction. Which action should the database specialist recommend to reduce cache misses?
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
✓
Change the eviction policy to allkeys-lru to allow Redis to evict less recently used keys.
Changing the eviction policy to allkeys-lru allows Redis to evict less recently used keys when memory is full, reducing cache misses. Option A is incorrect because simply increasing memory does not change the eviction policy; with noeviction, writes will fail when memory is full. Option C is incorrect because enabling AOF persistence improves durability but does not affect cache misses. Option D is incorrect because adding read replicas distributes read traffic but does not reduce cache misses if the keys are not in the cache.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Increase the memory of existing nodes to accommodate more keys.
Why it's wrong here
Increasing memory of existing nodes does not change the eviction policy; with noeviction, writes will fail when memory is full.
- ✓
Change the eviction policy to allkeys-lru to allow Redis to evict less recently used keys.
Why this is correct
Changing the eviction policy to allkeys-lru allows Redis to evict less recently used keys when memory is full, reducing cache misses.
- ✗
Enable AOF persistence to improve cache durability.
Why it's wrong here
Enabling AOF persistence improves durability but does not affect cache misses.
- ✗
Add more read replicas to distribute the cache load.
Why it's wrong here
Adding read replicas distributes read traffic but does not reduce cache misses if the keys are not in the cache.
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Last reviewed: Jun 20, 2026
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