DynamoDB query() versus getItem() for single-item retrieval based on the index

Question

If I\'m retrieving a single item from my table based on the indexed hash key, is there a performance difference between query() or getItem()?

Answer 1

In Amazon's DynamoDB, your performances are guaranteed whatever the access method. (you pay for it).

There may be a couple a milliseconds differences on the DynamoDB servers themselves as suggested by Chen Harel but these are negligible because of the HTTP request RTT.

This said, it's a good practice to issue a GET instead of QUERY when you have enough informations to do so.