Elasticity & Saclability

Question 1

Proactive Cycle Scaling

Answer 1

Scaling that occurs at a fixed interval

Question 2

Proactive Event-based scaling

Answer 2

occurs in anticipation of an event.

Question 3

Auto-scaling based on demand

Answer 3

occurs based off of increase in demand for the application

Question 4

Plan to scale out rather than up(horizontal scaling)

Answer 4

• add more EC2 instances to handle increases in capacity rather than increasing instance size.
• be sure to design for the proper instance size to start.
  -use tools like auto scaling and ELB.
  a scaled service should be fault tolerant and operationally efficient.
  scalable service should become more cost effective as it grows.

Question 5

DynamoDB is a fully managed NoSQL services from AWS

Answer 5

WITH HIGH AVAILABILITY AND SCALING ALREADY BUILT IN

- all the developer has to do is specify required throughput for the tables.

Question 6

RDS requires scaling in a few different ways

Answer 6

• -RDS does not support a cluster of instances to load balance traffic across.
• • Utilize read replicas to offload heavy read only traffic
• • increase the instance size to handle increase in load.
• • Utilize ElastiCache clusters for caching database session information.