Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 83 discussion

Exam question from Amazon's AWS Certified Solutions Architect - Associate SAA-C02

Question #: 83
Topic #: 1

[All AWS Certified Solutions Architect - Associate SAA-C02 Questions]

A company built an application that lets users check in to places they visit, rank the places, and add reviews about their experiences. The application is successful with a rapid increase in the number of users every month.
The chief technology officer fears the database supporting the current Infrastructure may not handle the new load the following month because the single Amazon
RDS for MySQL instance has triggered alarms related to resource exhaustion due to read requests.
What can a solutions architect recommend to prevent service Interruptions at the database layer with minimal changes to code?

A. Create RDS read replicas and redirect read-only traffic to the read replica endpoints. Enable a Multi-AZ deployment.
B. Create an Amazon EMR cluster and migrate the data to a Hadoop Distributed File System (HDFS) with a replication factor of 3.
C. Create an Amazon ElastiCache cluster and redirect all read-only traffic to the cluster. Set up the cluster to be deployed in three Availability Zones.
D. Create an Amazon DynamoDB table to replace the RDS instance and redirect all read-only traffic to the DynamoDB table. Enable DynamoDB Accelerator to offload traffic from the main table.

Show Suggested Answer

Suggested Answer: A 🗳️

by MPSaws at Aug. 9, 2020, 7:27 p.m.

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MPSaws

Highly Voted 3 years, 8 months ago

I agree A

upvoted 47 times

aguy9

3 years, 7 months ago

I agree, answer is A. This is a typical use case for read replicas

upvoted 6 times

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Priyaka

3 years, 8 months ago

why can't it be Elastic Cache ?..Since the review is wrote once we can use Elactic cache and read it again and again, better result. Use ElastiCache if the read data is static and read often. For example, if you are selling products and the products don't have changing details (Prices, titles, descriptions) use ElastiCache. Use a read replica for the other cases. For example, you have a content sharing service where many users are looking at many other users content (Tumblr for example). Caching all of the different users data would take up too much space, but allowing other users to read from a different database would make the strain on one database much less.

upvoted 6 times

sandeep138

3 years, 7 months ago

1. Elasticache would require code changes. 2. We do not know the read patterns. If reads are distinct cache may not be helpful. 3. Question says - "prevent service Interruptions". MultiAZ is certainly a requirement which is not mentioned explicitly along with Elasticache answer.

upvoted 3 times

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HudsonNg

3 years, 8 months ago

the question said "at the data layer". also, cache is not magic, it has HITS and MISSES and it's not always the latest data. You may need to revise the code a lot to make sure what can be cached and what CANNOT be. lot of work with cache.

upvoted 3 times

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Kuruvi

3 years, 8 months ago

Also Elastic Cache is useful for repeated read requests. In this case A is perfect.

upvoted 4 times

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