Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 431 discussion

Redis provides fast in-memory data storage and processing. It can compute the top 10 scores and update the cache in milliseconds. ElastiCache Redis supports sorting and ranking operations needed for the top 10 leaderboard. The cached leaderboard can be retrieved from Redis vs hitting the MySQL database for every read. This reduces load on the database. Redis supports persistence, so scores are preserved if the cache stops/restarts

Real-time gaming leaderboards are easy to create with Amazon ElastiCache for Redis. Just use the Redis Sorted Set data structure, which provides uniqueness of elements while maintaining the list sorted by their scores. Creating a real-time ranked list is as simple as updating a user's score each time it changes. You can also use Sorted Sets to handle time series data by using timestamps as the score. https://aws.amazon.com/elasticache/redis/#:~:text=ElastiCache%20for%20Redis.-,Gaming,-Leaderboards

ElastiCache for Redis sorts and ranks datasets

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

concurrently = memcached

See case study of leaderboard with Redis at https://redis.io/docs/data-types/sorted-sets/ , it is feature "sorted sets". See comparison between Redis an d Memcached at https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/SelectEngine.html , the different at feature "Sorted sets"

advanced data structures, complex querying, pub/sub messaging, or persistence, Redis may be a better fit.

B is correct

B correct.

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

Amazon ElastiCache for Redis is a highly scalable and fully managed in-memory data store. It can be used to store and compute the scores in real time for the top-10 scoreboard. Redis supports sorted sets, which can be used to store the scores as well as perform efficient queries to retrieve the top scores. By utilizing ElastiCache for Redis, the web application can quickly retrieve the current scores without the need to perform complex and potentially resource-intensive database queries.

B is right

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