text: If you enable a stream on a table, DynamoDB Streams writes a stream record whenever one of the 
  
  following events occurs: 
  
  • A new item is added to the table: the stream captures an image of the entire item, including all 
  
  of its attributes. 
  
  • An item is updated: the stream captures the "before" and "after" image of any attributes that 
  
  were modiﬁed in the item. 