Exam AWS Certified Developer - Associate DVA-C02 topic 1 question 22 discussion

A You can use Amazon Elasticache for Redis Sorted Sets to easily implement a dashboard that keeps a list of sorted data by their rank. https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/elasticache-use-cases.html#elasticache-for-redis-use-cases-gaming https://aws.amazon.com/elasticache/redis-vs-memcached/

To meet the requirements of caching frequently accessed data while adding the ability to sort or rank cached datasets, a developer should choose Amazon ElastiCache for Redis. ElastiCache is a web service that provides an in-memory data store in the cloud, and it supports both Memcached and Redis engines. While both engines are suitable for caching frequently accessed data, Redis is a better choice for this use case because it provides sorted sets and other data structures that allow for sorting and ranking of cached datasets. The data in ElastiCache can be encrypted at rest and in transit, ensuring the security of the PHI. Therefore, option A is the correct answer.

redis is having the sorting functionality

* Amazon ElastiCache service provide in-memory cache in the cloud. * Redis and MemCache are the 2 popular options which ElastiCache offerd for us. * Both support encryption at rest and transist (previously only redis supported this). * Redis offerd advance features like datastructures, transactions ,pub/sub etc. Since question is asking about most cost effective solution(already buit with MYSQL) , we have to ignore the DynamoDB option . Now we can pick Redis due to its natual sort facility.

B) Eliminated - Memcached does not support advanced data structure C) Eliminated - A read replica is not a true caching solution. It is a secondary database instance that replicates data for read-heavy workloads D) Eliminated - DynamoDB with DAX adds more operational overhead because you would be introducing a NoSQL database into the architecture when you're already using Amazon RDS (relational database) for storing data.

keyword: caching, sort, rank ==> discard B: not support 'sort' and 'rank' ==> discard C: not 'caching' ==> discard D: caching only support NoSQL dynamoDB && sort and rank belong to primary key (partition and secondary) of DynamoDB A fit all requirement

This question was on my exam July 23rd, 2024. Answer is A.

This appear at 17 Jun exam

A is the correct answer.

Sorted Sets in Elasticcache redis can do this job.

Redis is the best option to cached the results of queries and it also offer a encryption in-transit and at-rest

Redis: Supports various data structures such as strings, hashes, lists, sets, sorted sets, bitmaps, hyperloglogs, and geospatial indexes. Memcached: Primarily supports string-based keys and values; does not support advanced data structures.

ElastiCache for Redis also features Online Cluster Resizing, supports encryption, and is HIPAA eligible and PCI DSS compliant. https://aws.amazon.com/elasticache/redis-vs-memcached/