A company is hosting their website on a cluster of web servers behind a public-facing load balancer. The web application interacts with an AWS RDS database. It has been noticed that a set of similar types of queries is causing a performance bottleneck at the database layer. Which of the following architecture additions can help alleviate this issue?

Answer options:

A.Deploy ElastiCache in front of the web servers.
B.Deploy ElastiCache in front of the database servers.
C.Deploy Elastic Load balancer in front of the web servers.
D.Enable Multi-AZ for the database.

Answer – B
The AWS Documentation mentions the following.
Amazon ElastiCache offers fully managed Redis and Memcached. Seamlessly deploy, operate, and scale popular open source compatible in-memory data stores. Build data-intensive apps or improve your existing apps` performance by retrieving data from high throughput and low latency in-memory data stores.
Option A is incorrect since the database is having issues. Hence you need to ensure that ElastiCache is placed in front of the database servers.
Option C is incorrect since there is an issue with the database servers. So, we don’t need to add anything for the web servers.
Option D is incorrect since this is used for the high availability of the database.
For more information on ElastiCache, please visit the URL-
https://aws.amazon.com/elasticache/