iple scan operations against Amazon DynamoDB, which will use large
    amounts of your provisioned read throughput.  Using a predicate when
    fetching uses a get request against Amazon DynamoDB, which
    uses only the throughput necessary to load the single object.</li>
      <li>With the current version of the framework, <code>NSPredicates</code> are
    limited to only the properties that are mapped to hash keys.</li>
      <li>Save operations are not guaranteed to be transactional. You should ch