• S3 is not good at searching object
• We can use DynamoDB to save the metadata of S3 object
• Then do the search in DyanmoDB

• If you need to get data directly from DynamoDB, DAX is good for that
• If you need to perform some calucation which needs quite a bit time to complete, then save the result in ElasticCache, next time can fetch result directly from ElasticCache instead of doing calcuation in DAX or DyanmoDB again.

DynamoDB Overview

Limits: Each item max size is 400 KB.