tagResource 
  Associate a set of tags with an Amazon DynamoDB resource. You can then activate these user-defined tags so that they appear on the Billing and Cost Management console for cost allocation tracking. You can call TagResource up to five times per second, per account.
- TagResourceis an asynchronous operation. If you issue a ListTagsOfResource request immediately after a- TagResourcerequest, DynamoDB might return your previous tag set, if there was one, or an empty tag set. This is because- ListTagsOfResourceuses an eventually consistent query, and the metadata for your tags or table might not be available at that moment. Wait for a few seconds, and then try the- ListTagsOfResourcerequest again.
- The application or removal of tags using - TagResourceand- UntagResourceAPIs is eventually consistent.- ListTagsOfResourceAPI will only reflect the changes after a few seconds.
For an overview on tagging DynamoDB resources, see Tagging for DynamoDB in the Amazon DynamoDB Developer Guide.