Elasticache

Question 1

What is Elasticache

Answer 1

Web service for deploying, operating, scaling an in-memory cache in the cloud

Question 2

Use cases for Elasticache

Answer 2

improve latency, throughput for

read-heavy workloads (social media, gaming)
compute-intense workloads (recommendation engine)

Question 3

Two Types of Elasticache

Answer 3

memcached

redis

Question 4

What is memcached?

Answer 4

memory object caching system

Elasticache is protocol compliant with memcached so other tools will work with it

Question 5

What is redis?

Answer 5

open source in memory key-value store that supports data structures like sorted sets and lists

master-slave replication
multi-AZ capability

Question 6

For exam know which services will mitigate high stress or workload

Answer 6

Elasticache good choice if database is read-heavy and doesn’t change frequently

Redshift is good choice of database gets a lot of OLAP transactions

Also could look at read-replicas, dynamoDB, etc