1 Service tiers

• Tier 1 - Most important , Customer DBs
• Tier 2 - Still important
• Tier 3 - Not important , Data analytics

A Tier 3 serverless lambda should never be talking directly to a Tier 1 Customer DynamoDB.
How do we resolve this cross-tier talking? With a Message Queue like SQS.
A lambda should poll the queue, either one-by-one message or batch process multiple(cheaper)