What is the difference between scan and query in dynamodb? When use scan / query?

Question

A query operation as specified in DynamoDb documentation:

A query operation searches only primary key attribute values and supports a subset of compar

Answer 1

In terms of performance, I think it's good practice to design your table for applications to use Query instead of Scan. Because a scan operation always scan the entire table before it filters out the desired values, which means it takes more time and space to process data operations such as read, write and delete. For more information, please refer to the official document