Question 27
Domain 3: Cloud Technology and ServicesWhich service is best for storing common database query results, which helps to alleviate database access load?
Correct answer: C
Explanation
Amazon ElastiCache is a managed in-memory caching service used to store frequently accessed data, such as common database query results. By caching these results, applications reduce repeated database reads and "alleviate database access load."
Why each option is right or wrong
A. Amazon Machine Learning.
B. Amazon SQS.
C. Amazon ElastiCache.
Amazon ElastiCache is the AWS managed in-memory caching service designed to keep frequently requested data close to the application, so repeated reads do not have to hit the database each time. It supports Redis and Memcached, and because data is served from memory rather than disk-backed storage, it is the standard choice for caching common query results to reduce database read pressure and latency.
D. Amazon EC2 Instance Store.