Ravi Sir's Cards › AWS
Streams CDC map
This revision card explains Streams CDC map. It starts from the need that polling the table for changes is slow and expensive. It describes enable Streams , then pick view type , then Lambda (idempotent + DLQ) , then sink. The how-to section notes iteratorAge alarm , then fan-out via SNS/EventBridge when many teams. An example on the card is fintech audit for Elena uses NEW_AND_OLD_IMAGES into an append-only table.
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What this card says
Why do we need it?
Polling the table for changes is slow and expensive.
What is it?
Enable Streams → pick view type → Lambda (idempotent + DLQ) → sink.
DynamoDB Streams
How to do it
IteratorAge alarm → fan-out via SNS/EventBridge when many teams.
Example
Fintech audit for Elena uses NEW_AND_OLD_IMAGES into an append-only table.