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Answer: Implement Amazon ElastiCache to cache frequent query results.
The correct answer is A: 'Implement Amazon ElastiCache to cache frequent query results.' By using Amazon ElastiCache, you can cache the results of frequently accessed queries, which will reduce the read load on the Amazon RDS instance. This is particularly beneficial for applications with a high read-to-write ratio, as it prevents repeated queries to the database, thereby improving performance and reducing the ReadLatency metric observed during peak usage times.
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In a three-tier application deployed on Amazon ECS with a MySQL RDS instance, which action should a developer take to improve performance during peak usage when the ReadLatency metric spikes due to a higher read-to-write ratio?
A
Implement Amazon ElastiCache to cache frequent query results.
B
Increase the number of ECS instances in the cluster.
C
Enhance the DB instance with additional read capacity units.
D
Adjust the ECS task definition to allocate more memory.