returnValues

Use ReturnValues if you want to get the item attributes as they appear before or after they are successfully updated. For UpdateItem, the valid values are:

• NONE - If ReturnValues is not specified, or if its value is NONE, then nothing is returned. (This setting is the default for ReturnValues.)

• ALL_OLD - Returns all of the attributes of the item, as they appeared before the UpdateItem operation.

• UPDATED_OLD - Returns only the updated attributes, as they appeared before the UpdateItem operation.

• ALL_NEW - Returns all of the attributes of the item, as they appear after the UpdateItem operation.

• UPDATED_NEW - Returns only the updated attributes, as they appear after the UpdateItem operation.

There is no additional cost associated with requesting a return value aside from the small network and processing overhead of receiving a larger response. No read capacity units are consumed.

The values returned are strongly consistent.