policy
An Amazon Web Services resource-based policy document in JSON format.
- The maximum size supported for a resource-based policy document is 20 KB. DynamoDB counts whitespaces when calculating the size of a policy against this limit. 
- Within a resource-based policy, if the action for a DynamoDB service-linked role (SLR) to replicate data for a global table is denied, adding or deleting a replica will fail with an error. 
For a full list of all considerations that apply while attaching a resource-based policy, see Resource-based policy considerations.