DBS-C01 Monitoring and Troubleshooting Practice Question
A company is using Amazon ElastiCache for Redis and notices that the cache hit ratio is low. The application is frequently reading data that is not in the cache. Which action would be most effective in improving the cache hit ratio?
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
✓
Pre-warm the cache by loading frequently accessed data from the database.
Pre-warming the cache (option C) by loading frequently accessed data from the database into the ElastiCache cluster before it is requested increases the likelihood that subsequent reads will hit the cache. This directly improves the cache hit ratio. Increasing replicas (option A) does not add more cache capacity, it only provides read replicas for high availability. Decreasing TTL (option B) causes items to expire sooner, potentially reducing the hit ratio. Enabling Multi-AZ (option D) provides failover but does not affect hit ratio. Therefore, option C is the most effective action.
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 number of replicas in the replication group.
Why it's wrong here
Replicas improve read scalability but do not increase the cache size or hit ratio.
- ✗
Decrease the TTL of cached items to ensure freshness.
Why it's wrong here
Decreasing TTL may cause more cache misses, reducing hit ratio.
- ✓
Pre-warm the cache by loading frequently accessed data from the database.
Why this is correct
Pre-warming ensures that the most requested data is already in the cache, improving hit ratio.
- ✗
Enable Multi-AZ for automatic failover.
Why it's wrong here
Multi-AZ provides high availability, not help with hit ratio.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This DBS-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 DBS-C01 exam.