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Question 152 - DVA-C02 discussion

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A developer is working on a web application that uses Amazon DynamoDB as its data store The application has two DynamoDB tables one table that is named artists and one table that is named songs The artists table has artistName as the partition key. The songs table has songName as the partition key and artistName as the sort key

The table usage patterns include the retrieval of multiple songs and artists in a single database operation from the webpage. The developer needs a way to retrieve this information with minimal network traffic and optimal application performance.

Which solution will meet these requirements'?

A.
Perform a BatchGetltem operation that returns items from the two tables. Use the list of songName artistName keys for the songs table and the list of artistName key for the artists table.
Answers
A.
Perform a BatchGetltem operation that returns items from the two tables. Use the list of songName artistName keys for the songs table and the list of artistName key for the artists table.
B.
Create a local secondary index (LSI) on the songs table that uses artistName as the partition key Perform a query operation for each artistName on the songs table that filters by the list of songName Perform a query operation for each artistName on the artists table
Answers
B.
Create a local secondary index (LSI) on the songs table that uses artistName as the partition key Perform a query operation for each artistName on the songs table that filters by the list of songName Perform a query operation for each artistName on the artists table
C.
Perform a BatchGetltem operation on the songs table that uses the songName/artistName keys. Perform a BatchGetltem operation on the artists table that uses artistName as the key.
Answers
C.
Perform a BatchGetltem operation on the songs table that uses the songName/artistName keys. Perform a BatchGetltem operation on the artists table that uses artistName as the key.
D.
Perform a Scan operation on each table that filters by the list of songName/artistName for the songs table and the list of artistName in the artists table.
Answers
D.
Perform a Scan operation on each table that filters by the list of songName/artistName for the songs table and the list of artistName in the artists table.
Suggested answer: A

Explanation:

Scenario:Application needs to fetch songs and artists efficiently in a single operation.

BatchGetItem:This DynamoDB operation retrieves multiple items across different tables based on their primary keys in a single request.

Optimized for Request Batching:This approach reduces network traffic compared to performing multiple queries individually.

Data Modeling:Thesongstable is designed appropriately for this access pattern usingartistNameas the sort key.

Amazon DynamoDB BatchGetItem:https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchGetItem.ht

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asked 16/09/2024
Mostafa Mohamed
37 questions
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