title: Time to live of a item in dynamodb
body: <p>I am playing with amazon dynamodb no-sql database from past few days and wondering that if there is any feature <strong><em>time to live (TTL)</em></strong> of a item, so that when item reached at that value it
  automatically deleted from table as per the <strong><em>TTL</em></strong> value, instead of doing manually batch delete item.</p>