Database

Amazon DynamoDB Streams

Amazon DynamoDB Streams captures a time-ordered sequence of item-level changes for up to 24 hours. It lets GenAI workflows react to state transitions without polling the table.

Key points

Each item modification appears once in its item-specific stream order
Stream views can include keys and old or new images
Lambda event-source mappings checkpoint and retry record batches

When to use it

Trigger embedding refresh when a product record changes
Publish an audit enrichment job after a conversation state update

Exam tips

Use Streams for DynamoDB change data; EventBridge is broader event routing
Handle partial batch failures and idempotency so one poison record does not replay successful side effects

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