Batch limits and retries in DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the maximum number of items you can write in a single DynamoDB batch write operation?

You can write up to 25 items in a single batch write operation in DynamoDB.

intermediate

Why does DynamoDB batch write sometimes return unprocessed items?

DynamoDB may return unprocessed items when the request exceeds throughput limits or internal errors occur. These items need to be retried.

intermediate

How should you handle unprocessed items returned from a DynamoDB batch write?

You should retry the unprocessed items with exponential backoff until all items are successfully written.

beginner

What is the maximum number of items you can read in a single DynamoDB batch get operation?

You can read up to 100 items in a single batch get operation in DynamoDB.

beginner

Explain why batch operations in DynamoDB are more efficient than individual requests.

Batch operations reduce the number of network calls by grouping multiple requests, which lowers latency and improves throughput.

What is the maximum number of items allowed in a DynamoDB batch write request?

A 25

B 50

C 100

D 10

DynamoDB batch write supports up to 25 items per request.

If a batch write returns unprocessed items, what should you do?

A Ignore them

B Retry them with exponential backoff

C Retry them immediately without delay

D Delete the unprocessed items

Unprocessed items should be retried with exponential backoff to avoid overwhelming the service.

What is the maximum number of items you can request in a DynamoDB batch get operation?

A 200

B 50

C 25

D 100

Batch get operations can request up to 100 items at once.

Why might DynamoDB return unprocessed items in batch operations?

A Because the items are invalid

B Because the table is deleted

C Due to exceeding provisioned throughput or internal throttling

D Because the items are duplicates

Unprocessed items usually happen when throughput limits are exceeded or throttling occurs.

Which of the following is a benefit of using batch operations in DynamoDB?

A They reduce the number of network calls

B They guarantee transaction atomicity

C They increase item size limits

D They automatically retry failed requests

Batch operations reduce network calls by grouping multiple requests.

Describe the limits and retry strategy for DynamoDB batch write operations.

Think about how many items you can send at once and what to do if some fail.

Explain why batch operations are useful in DynamoDB and how to handle failures.

Consider efficiency and error handling.