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Why is an AWS DynamoDB Stream

DynamoDB Streams captures:

• a time-ordered sequence
• of item-level modifications
• in any DynamoDB table and
• stores this information in a log
• for up to 24 hours.
• Applications can access this log and view the data items
• as they appeared before and after they were modified,
• in near-real-time.

see here https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Streams.html

Before and After Modified

• What information captured is configurable

Time-Ordered Sequence

• Each stream item unique
• Ordered in the same order as the actual change to items

Near-Real-Time

• streams write records in near-real-time

Applications Can Access This Log

• Two separate endpoints, one for dynamoDB and another for dynamoDBStreams

This makes dynamodb tables into an event stream that can be used in other components and applications.