Simplify cross-account stream processing with AWS Lambda and Amazon DynamoDB

This article explains how to use resource-based policies to enable AWS Lambda functions in one AWS account to directly consume DynamoDB Streams from tables in another account, eliminating the need for custom relay infrastructure.

• Resource-based policies on DynamoDB Streams grant cross-account Lambda access without custom infrastructure
• Lambda manages ingestion, filtering, delivery, retries, and error handling automatically
• Enables centralized data processing, shared services, and multi-tenant architectures
• Requires resource policy on stream (source account) and IAM execution role (consuming account)
• Both DynamoDB table and Lambda function must be in the same AWS Region
• No additional charges beyond standard DynamoDB Streams and Lambda pricing
• Includes step-by-step setup using AWS CLI with variables for reusability

This feature simplifies cross-account event-driven architectures for SaaS providers, centralized analytics, and isolated multi-account environments while maintaining strong access control.