aws dynamodb streams

A time ordered sequence of item level modifications (insert, update, delete).

Features

• These are stored in an encrypted log for 24 hours. This is good for ordering,

archiving, and replaying events in a table.

• Typically the stream systems are used for event triggering (like a lambda function).
• The streams are accessed with their own dedicated endpoint separate from the table.
• By default the minimum amount of data that can be recorded is the primary key.
• Before and after images can also be captured, showing changes.

Events are logged in near real-time, which is great for serverless architectures. The content of the stream (data) can be used for application development.

Example: Lambda polls the DynamoDB stream for changes, then triggers different functions based on the data.

Use cases

• Audit or archive transactions
• Replicate data across multiple tables
• Trigger an event driven application

Exam tips

1. Sequence of modifications - the steram is a time-ordered sequence of item level

modifications in your DynamoDB tables

1. Encrypted and stored - data is stored for 24 hours
2. Lambda event source - can be used as an event source for Lambda