Your development team is currently working with an application that interacts with the DynamoDB table. Due to the proposed extensive use of the application, the underlying DynamoDB table would undergo a steady growth in size. Which of the following preferred options should be used for retrieving the data? Choose 3 answers from the options given below.

Answer options:

A.Use the query operation.
B.Use the Scan operation.
C.Use the GetItem API command.
D.Use the BatchGetItem API command.

Answer – A, C and D
The AWS Documentation mentions the following.
If possible, you should avoid using a Scan operation on a large table or index with a filter that removes many results. Also, as a table or index grows, the Scan operation slows. The Scan operation examines every item for the requested values and can use up the provisioned throughput for a large table or index in a single operation. For faster response times, design your tables and indexes so that your applications can use Query instead of Scan. (For tables, you can also consider using the GetItem and BatchGetItem APIs.)
Option B is incorrect since this would cause performance issues as the amount of items starts to increase.
For more information on best practices for the query and scan operation, please refer to the below URL-
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/bp-query-scan.html