Exam AWS Certified Solutions Architect - Associate SAA-C02 All Questions

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Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 306 discussion

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

Question #: 306
Topic #: 1

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

A company has developed a new video game as a web application. The application is in a three-tier architecture in a VPC with Amazon RDS for MySQL. In the database layer several players will compete concurrently online. The game's developers want to display a top-10 scoreboard in near-real time and offer the ability to stop and restore the game while preserving the current scores.
What should a solutions architect do to meet these requirements?

A. Set up an Amazon ElastiCache for Memcached cluster to cache the scores for the web application to display.
B. Set up an Amazon ElastiCache for Redis cluster to compute and cache the scores for the web application to display.
C. Place an Amazon CloudFront distribution in front of the web application to cache the scoreboard in a section of the application.
D. Create a read replica on Amazon RDS for MySQL to run queries to compute the scoreboard and serve the read traffic to the web application.

Show Suggested Answer

Suggested Answer: B 🗳️

by Alileva at March 13, 2021, 6:37 a.m.

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Alileva

Highly Voted 3 years, 8 months ago

Answer is B https://aws.amazon.com/blogs/database/building-a-real-time-gaming-leaderboard-with-amazon-elasticache-for-redis/

upvoted 64 times

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syu31svc

Highly Voted 3 years, 8 months ago

https://aws.amazon.com/blogs/database/building-a-real-time-gaming-leaderboard-with-amazon-elasticache-for-redis/ AWS Blog title says it all B is the answer

upvoted 23 times

Jobair

2 years, 7 months ago

Indeed, Redis "Supports a data structure optimized to handle leaderboard use cases."

upvoted 1 times

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sb555555

Most Recent 3 years, 1 month ago

Selected Answer: B

has to be redis

upvoted 3 times

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envest

3 years, 4 months ago

IMO: of course B, https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/elasticache-use-cases.html

upvoted 1 times

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Farsim

3 years, 4 months ago

Selected Answer: B

I think its B....Elasticache for Redis has sub millisecond latency when retrieving data

upvoted 2 times

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jj22222

3 years, 5 months ago

BBBBBBBBBBBBB

upvoted 4 times

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pikaflash

3 years, 5 months ago

Selected Answer: B

https://aws.amazon.com/blogs/database/building-a-real-time-gaming-leaderboard-with-amazon-elasticache-for-redis/

upvoted 3 times

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Milan_S

3 years, 6 months ago

I am confused between choices A & B. Can anyone explain why memcached can't be an option ?

upvoted 2 times

Lotzy

3 years, 3 months ago

I think it's about persistence, with Redis you can persist the cache, while Memcached will be lost on a restart of the service (but even so you will still have the MySQL DB, so yes, a bit confusing). Also "Memcached is designed for simplicity while Redis offers a rich set of features that make it effective for a wide range of use cases." from here https://aws.amazon.com/elasticache/redis-vs-memcached/, so maybe is suitable for more complex data caching needed for game sessions and scores. And one more thing: B answer contains word "compute", which I suppose is needed for ranking.

upvoted 5 times

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Ultron00

3 years, 6 months ago

B https://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/elasticache-use-cases.html

upvoted 1 times

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kernel1973

3 years, 6 months ago

C Redis lets you sort and rank data, allowing you to support, say, an online gaming application that maintains a leaderboard ranking the top users. The fact that Redis can persist data makes it possible to use Redis to maintain session caching, potentially improving performance.

upvoted 2 times

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ecastilla

3 years, 7 months ago

I think it's D: "near real-time"

upvoted 1 times

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Cotter

3 years, 7 months ago

B or D?

upvoted 1 times

jiaminjiamin

2 years, 10 months ago

One key difference between sorted sets and relational databases is when the tool sorts the list. During insert or update operations, sorted sets automatically position the item in the right order. Because of this pre-sorting, queries run significantly faster. You can quickly and efficiently query the middle of the list or get the rank of a specific member. Sorted sets finds specific rankings logarithmically, proportional to the number of members. By contrast, relational databases order items during querying, adding computational burden to the database. Obtaining the rank of a specific player involves quadratic time complexity. https://aws.amazon.com/blogs/database/building-a-real-time-gaming-leaderboard-with-amazon-elasticache-for-redis/

upvoted 1 times

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IdrisAWS

3 years, 7 months ago

Answer is B Gaming leaderboards enable players to gauge their performance against each other. This important social feature increases players’ engagement and encourages competition. Leaderboard data can also inform in-game algorithms that match players against competitors of similar skill levels. In this post, I explore the challenges around building and scaling gaming leaderboards using traditional relational databases. I also examine how to leverage modern in-memory data stores such as Redis to provide a highly efficient and scalable solution. This proposed solution pushes leaderboard storage and querying away from the relational database toward the more versatile Amazon ElastiCache for Redis. The approach outlined here applies not only to gaming leaderboards, but generally to any situation for generating ranking within an application.

upvoted 8 times

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NarikNinja

3 years, 7 months ago

Ans: D requirement is of reporting, so read replica will do. Preserving is distractor

upvoted 2 times

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abdelrhman

3 years, 7 months ago

B for me https://aws.amazon.com/blogs/database/building-a-real-time-gaming-leaderboard-with-amazon-elasticache-for-redis/

upvoted 4 times

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cryogenic007

3 years, 8 months ago

I was hesitant with A initially but looking at this on AWS portal it makes sense to go with A. https://aws.amazon.com/elasticache/redis/ Use cases: Amazon ElastiCache for Redis is a great choice for real-time transactional and analytical processing use cases such as caching, chat/messaging, gaming leaderboards, geospatial, machine learning, media streaming, queues, real-time analytics, and session store.

upvoted 3 times

cryogenic007

3 years, 7 months ago

My bad, I meant to say B instead of A.

upvoted 5 times

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jkwek

3 years, 8 months ago

Answer is B. The url revealed the answer. https://aws.amazon.com/blogs/database/building-a-real-time-gaming-leaderboard-with-amazon-elasticache-for-redis/ Redis offers one highly efficient and scalable solution. Redis is an in-memory data store that supports basic key-value functionality. It also supports a variety of data structures such as hashes, lists, sets, sorted sets, range queries, and geospatial indexes. This suggests the potential advantages of storage and querying through ElastiCache for Redis instead of through relational databases.

upvoted 6 times

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