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Exam AWS Certified SysOps Administrator - Associate topic 1 question 391 discussion

Exam question from Amazon's AWS Certified SysOps Administrator - Associate
Question #: 391
Topic #: 1
[All AWS Certified SysOps Administrator - Associate Questions]

An ecommerce company uses an Amazon ElastiCache for Redis cluster for in-memory caching of popular product queries on a shopping website. The cache eviction policy is randomly evicting keys whether or not a TTL is set. A SysOps administrator must improve the cache hit ratio without increasing costs.

Which solution will meet these requirements?

  • A. Add another node to the ElastiCache cluster.
  • B. Increase the ElastiCache TTL value.
  • C. Change the eviction policy to randomly evict keys that have a TTL set.
  • D. Change the eviction policy to evict the least frequently used keys.
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Suggested Answer: D 🗳️
by nharaz at Jan. 1, 2024, 7:40 p.m.
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Kipalom
Highly Voted 10 months ago
Selected Answer: D
"The cache eviction policy is randomly evicting keys whether or not a TTL is set." is a sign that currently the eviction policy "allkeys-random" is in use. As we want to drop frequently used entries the answer should be "allkeys-lfu" for evicting least frequently used entries.
upvoted 8 times
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Learning4life
Most Recent 9 months ago
Selected Answer: D
See chart for eviction policies https://docs.aws.amazon.com/whitepapers/latest/database-caching-strategies-using-redis/evictions.html
upvoted 4 times
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nharaz
10 months ago
Selected Answer: D
Ways to Improve Cache Hit Ratio for Cost Reduction: To improve your CHR, consider optimizing your caching strategy. This could involve fine-tuning TTL (Time-To-Live) parameters, implementing LRU (Least Recently Used) eviction policies, or increasing cache size. https://www.dragonflydb.io/guides/elasticache-cost-optimization
upvoted 1 times
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