Why change tracking enables reactions in DynamoDB - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to enable DynamoDB Streams for change tracking on a table.

DynamoDB

aws dynamodb update-table --table-name MyTable --stream-specification StreamEnabled=[1],StreamViewType=NEW_AND_OLD_IMAGES

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Atrue

Bfalse

Cenabled

Don

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'false' disables change tracking.

Using strings like 'enabled' or 'on' are invalid here.

Setting StreamEnabled=true activates DynamoDB Streams, which tracks changes.

2fill in blank

medium

Complete the code to read change events from a DynamoDB Stream using AWS CLI.

DynamoDB

aws dynamodbstreams get-records --[1]

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AshardIterator

BShardIterator

Cshard-iterator

DSHARDITERATOR

Attempts:

3 left

💡 Hint

Common Mistakes

Using camelCase or uppercase parameter names causes errors.

Misspelling the parameter name.

The correct parameter name is ShardIterator in PascalCase.

3fill in blank

hard

Fix the error in the code to filter DynamoDB Stream events for INSERT operations only.

DynamoDB

if event['eventName'] == '[1]': process(event)

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AINSERT

BREMOVE

CUPDATE

DMODIFY

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'UPDATE' or 'MODIFY' instead of 'INSERT'.

Using lowercase event names.

The event name for new items added is INSERT.

4fill in blank

hard

Fill both blanks to create a DynamoDB Stream ARN for a table in region us-east-1.

DynamoDB

arn:aws:dynamodb:[1]:123456789012:table/[2]/stream/2023-01-01T00:00:00.000

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Aus-east-1

Bus-west-2

CMyTable

DYourTable

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up region codes.

Using wrong table names in the ARN.

The region is 'us-east-1' and the table name is 'MyTable' to form the correct ARN.

5fill in blank

hard

Fill all three blanks to create a Python dictionary comprehension that maps item IDs to new values from DynamoDB Stream records where the event is INSERT.

DynamoDB

result = {record['dynamodb']['Keys']['ID']['S']: record['dynamodb']['NewImage']['Value']['S'] for record in records if record['eventName'] == '[1]' and '[2]' in record['dynamodb']['NewImage'] and record['dynamodb']['NewImage']['Value']['S'] [3] ''}

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AINSERT

BValue

C!=

DKeys

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong event names like 'MODIFY'.

Checking wrong keys in the dictionary.

Using '=' instead of '!=' for comparison.

We filter for 'INSERT' events, check 'Value' key exists, and ensure the value is not empty using '!='.