What is one key difference between an Amazon EBS-backed and an instance-store backed
instance?

Company B provides an online image recognition service and utilizes SOS to decouple
system components for scalability The SQS consumers poll the imaging queue as often as
possible to keep end-to-end throughput as high as possible. However, Company B is
realizing that polling in tight loops is burning CPU cycles and increasing costs with empty
responses. How can Company B reduce the number of empty responses?

What item operation allows the retrieval of multiple items from a DynamoDB table in a single
API call?

In DynamoDB, what type of HTTP response codes indicate that a problem was found with
the client request sent to the service?

If a message is retrieved from a queue in Amazon SQS, how long is the message
inaccessible to other users by default?