Optimizing Query Performance
Question
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?
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D.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/The performance issue of the application is caused by the same read queries to the database. To alleviate this issue, we need to reduce the load on the database and increase the speed of read queries. Here are the available options:
A. Place an ELB in front of the web layer: An Elastic Load Balancer (ELB) can distribute incoming traffic across multiple instances of the web layer. While this can improve the scalability and fault tolerance of the web layer, it does not address the performance issue with the database.
B. Place an ELB in front of the database layer: Placing an ELB in front of the database layer can help distribute traffic across multiple RDS instances. However, this can only help if the performance issue is related to high traffic, and not caused by the query patterns. Moreover, read queries are typically handled by the primary RDS instance, so distributing read traffic across multiple instances may not improve performance.
C. Place an ElastiCache in front of the database layer: Amazon ElastiCache is a managed in-memory caching service that can be used to improve the performance of read queries. By caching frequently accessed data in memory, ElastiCache can reduce the number of read queries that hit the database, thus reducing the load on the RDS instance and improving query response times.
D. Place an ElastiCache in front of the web layer: Placing an ElastiCache in front of the web layer can improve the speed of read queries by caching frequently accessed data in memory. However, this does not address the root cause of the performance issue, which is the load on the RDS instance.
Therefore, the best option to alleviate the performance issue caused by the same read queries is to place an ElastiCache in front of the database layer (option C). This can significantly reduce the load on the RDS instance and improve query response times.
