What operation should you use to find an item in a DynamoDB table using an attribute other than the item's primary key?

To find an item in a DynamoDB table using an attribute other than the primary key, the appropriate operation to employ is a scan.

The scan operation examines every item in the table, returning those that match the specified criteria for the attribute you are interested in. This enables you to filter results based on non-key attributes. It is a powerful option when you do not have direct access to the primary key or when you want to analyze the entire dataset for specific conditions.

On the other hand, the query operation is designed to search for items based on the primary key and can only search efficiently within a specified partition. While GetItem is used to retrieve a single item based solely on its primary key, PutItem is for adding or replacing an item in the table. Therefore, in scenarios where you need to look up items using non-key attributes, scan is the appropriate choice.