Performant Architectures

Question 1

Best practices for performant architecture

Answer 1

performant storage and databases
apply caching
for elasticity and scalability

Question 2

static content

Answer 2

offload to s3 instead of keeping it on servers. takes the load off your websever. EBS only used to serve dynamic content

Question 3

Use cases for Amazon RDS

Answer 3

Complex transactions
medium to high query or wite rate
no more than a single worker node(master) per shard
high durability(also available in dynamo DB)

Question 4

Do not use RDS when

Answer 4

Massive read write rates
sharding
simple get put
RDBMS customization

Question 5

Dynamo DB is suited for

Answer 5

key value access patterns

Question 6

Dynamo DN

Answer 6

You don’t specify how much space you need. It grows as your data footprint changes

Question 7

What throughput do you configure in Dynamo DB

Answer 7

RCU and WCU.
Read capacity unit. ( 1 RCU = 1 strongly consistent per second, 2 eventually consistent read per second) 4KB in size
1 WCU 1KB in size
Dynamo DB scales the table as per the requirement

Question 8

cloudfront can be used for both static and dynamic

Answer 8

You can seve with TTL of zero. It is not for caching . The read and write is happnning over AWS backbone network and not on internet.

Question 9

cloudfront dynamic content origin

Answer 9

ELB or EC2, http servers

Question 10

cloudfront static content origin

Answer 10

S3

Question 11

Implement elasticity with ASG, ELB and cloudwatch

Answer 11

Cloudwatch monitor instances
raise alarms when metrics exceed threashold
SNS intercepted by ASG.

Question 12

What can cloudwatch monitor

Answer 12

CPU, queue size, network utilization

Question 13

storage solution for unstructured data that is generally preferred

Answer 13

S3