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Exam AWS Certified Developer - Associate DVA-C02 topic 1 question 93 discussion

Exam question from Amazon's AWS Certified Developer - Associate DVA-C02

Question #: 93
Topic #: 1

[All AWS Certified Developer - Associate DVA-C02 Questions]

A developer is building an application that uses Amazon DynamoDB. The developer wants to retrieve multiple specific items from the database with a single API call.

Which DynamoDB API call will meet these requirements with the MINIMUM impact on the database?

A. BatchGetItem
B. GetItem
C. Scan
D. Query

Show Suggested Answer

Suggested Answer: A 🗳️

by MrTee at April 21, 2023, 6:15 p.m.

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MrTee

Highly Voted 2 years, 4 months ago

Selected Answer: A

A Is the correct answer with the minimum impact on the database.

upvoted 12 times

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dan80

Highly Voted 2 years, 3 months ago

Selected Answer: A

https://beabetterdev.com/2022/10/12/dynamodb-getitem-vs-query-when-to-use-what/#:~:text=If%20you'd%20like%20to%20retrieve%20multiple%20items%20at%20once,retrieve%20multiple%20items%20at%20once.

upvoted 9 times

jipark

2 years ago

tons of thanks. Looking for just a single item on the main table index? Use GetItem Looking for just a single item on a GSI? Use Query. Looking for multiple items with different partition key and sort key combinations at once? Use BatchGetItem Looking for multiple items that share the same partition key? Use Query

upvoted 16 times

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sumanshu

Most Recent 7 months, 3 weeks ago

Selected Answer: A

B) Eliminated - The GetItem API retrieves only one specific item at a time by its primary key. C) Eliminated - The Scan API retrieves all items in a table or index by sequentially scanning every item. D) Eliminated - The Query API retrieves all items that match a specific partition key and optionally filters them by sort key or other criteria.

upvoted 1 times

sumanshu

6 months, 1 week ago

CustomerID OrderID OrderDetails 123 A001 Shoes 123 A002 Jacket 123 A003 Watch If you need to retrieve all orders for CustomerID = 123, a Query would work well because all the needed items share the same partition key

upvoted 1 times

sumanshu

6 months, 1 week ago

Suppose you need to retrieve multiple orders, but for different customers: CustomerID OrderID OrderDetails 123 A001 Shoes 456 B002 Laptop 789 C003 Phone Here, the partition keys are different (123, 456, 789). A Query won't work because it can only retrieve items for one partition key at a time. BatchGetItem is the best choice because it allows retrieving specific items across multiple partition keys in a single API call.

upvoted 1 times

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Saudis

11 months, 1 week ago

A key word is retrieve multiple specific items

upvoted 1 times

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65703c1

1 year, 3 months ago

Selected Answer: A

A is the correct answer.

upvoted 1 times

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Moralles

1 year, 4 months ago

Selected Answer: A

• GetItem: recupera um único item de uma tabela. • BatchGetItem: retorna até 100 itens de uma ou mais tabelas limitados a 16MB por chamada.

upvoted 1 times

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marolisa

1 year, 11 months ago

D. "Query" allows you to use filter - multiple specific items and is less expensive than the Sacan operation.

upvoted 1 times

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Baba_Eni

2 years, 2 months ago

Selected Answer: A

https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_BatchGetItem.html

upvoted 1 times

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imvb88

2 years, 2 months ago

Selected Answer: A

Need specific Item -> cannot be Scan or Query since they are for retrieving items that match conditions. We need multiple item then A is the option left.

upvoted 2 times

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