TransactWriteItems in DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is TransactWriteItems in DynamoDB?

It is a DynamoDB operation that lets you perform multiple write actions (like put, update, delete) in a single, all-or-nothing transaction.

beginner

Why use TransactWriteItems instead of multiple separate writes?

Because it ensures all writes succeed or none do, keeping your data consistent like a single atomic action.

intermediate

Name the types of write actions supported by TransactWriteItems.

Put (add item), Update (change item), Delete (remove item), and ConditionCheck (check condition without writing).

beginner

What happens if one write action in TransactWriteItems fails?

All write actions are rolled back, so no changes are saved. This keeps your data safe and consistent.

intermediate

What is the maximum number of actions you can include in a single TransactWriteItems request?

You can include up to 25 actions in one transaction.

What does TransactWriteItems guarantee in DynamoDB?

A Only one write is allowed per transaction

B Writes happen in parallel without order

C Writes are delayed by 24 hours

D All writes succeed or none do

TransactWriteItems ensures atomicity, meaning all writes succeed together or all fail together.

Which of these is NOT a valid action in TransactWriteItems?

A Select

B Update

C Put

D Delete

Select is a read operation, not a write action, so it is not supported in TransactWriteItems.

How many write actions can you include in one TransactWriteItems request?

A 50

B 10

C 25

D 100

The maximum number of actions per TransactWriteItems request is 25.

If one action in a TransactWriteItems request fails, what happens?

A Only the failed action is skipped

B All actions are rolled back

C All actions succeed anyway

D The transaction retries automatically forever

The entire transaction is rolled back to keep data consistent.

Which of these is a benefit of using TransactWriteItems?

A Atomic writes

B No need for conditions

C Unlimited actions per request

D Faster reads

TransactWriteItems provides atomic writes, ensuring all-or-nothing changes.

Explain how TransactWriteItems helps maintain data consistency in DynamoDB.

Think about what happens if one write fails in a group of writes.

List and describe the types of write actions supported by TransactWriteItems.

Remember it supports more than just adding or deleting.