What is the API call used to retrieve multiple items from a DynamoDB table?

The API call used to retrieve multiple items from a DynamoDB table is BatchGetItem. This operation allows you to request multiple items from one or more tables in a single request, making it efficient for retrieving a batch of data without the overhead of making several individual requests.

Using BatchGetItem is optimal because it reduces the number of individual read requests, which can improve performance and reduce latency in your applications. Each call can retrieve up to 100 items or a total size of 16 MB, accommodating larger data retrieval needs efficiently.

In contrast, the other options are tailored for different use cases. GetItem is designed to retrieve a single item based on its primary key, making it unsuitable for multiple items. BatchWriteItem is specifically for writing multiple items into a table, not for reading. QueryItem does not exist as a standard API call within DynamoDB; the correct term would simply be "Query," which is designed to retrieve items based on specific attributes but again, typically focused on a single table or partition rather than multiple items in bulk.

In summary, BatchGetItem is the correct and efficient choice for retrieving multiple items from a DynamoDB table.