You are currently developing an application that consists of a web layer hosted on an EC2 Instance. This is interacting with the database layer using the AWS RDS Instance. You are noticing that the same query reads are causing performance issues. Which of the following can be used to alleviate this issue?

Answer options:

A.Place an ELB in front of the web layer.
B.Place an ELB in front of the database layer.
C.Place an ElastiCache in front of the database layer.
D.Place an ElastiCache in front of the web layer.

Answer – C
This is mentioned in the AWS Documentation.
Amazon ElastiCache offers fully managed Redis and Memcached. Seamlessly deploy, run, and scale popular open source compatible in-memory data stores. Build data-intensive apps or improve the performance of your existing apps by retrieving data from high throughput and low latency in-memory data stores. Amazon ElastiCache is a popular choice for Gaming, Ad-Tech, Financial Services, Healthcare, and IoT apps.
Options A and B are incorrect since the ELB will not resolve the issue. It can only direct the traffic and not reduce the latency issues.
Option D is incorrect since this should ideally be placed in front of a data store.
For more information on ElastiCache, please visit the following URL-
https://aws.amazon.com/elasticache/