Streams

Streams

• Everytime an Iteam changes in a table, change is recorded chronologically in a stream
• 24 hour rolling window
• Needs to be enabled on per table basis
• Inserts, updates & deletes are recorded
• Views can be configured for a stream which decide what is captured in a stream
• 4 View types are
• KEYS_ONLY (Partition Key & Sort Key of changed item)
• NEW_IMAGE (Entire updated item)
• OLD_IMAGE (Item before the change)
• NEW_AND_OLD_IMAGES (Both pre and post item)

Triggers

• Item change generates an event.Event contains data based on the view type
• An action is performed in form of a Lambda function execution