Stream processing patterns in DynamoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to read records from a DynamoDB stream.

DynamoDB

for record in event['Records']:
    print(record['[1]'])

Drag options to blanks, or click blank then click option'

AeventName

BstreamViewType

CawsRegion

Ddynamodb

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'dynamodb' instead of 'eventName' will print the whole DynamoDB data, not the event type.

Using 'streamViewType' or 'awsRegion' does not give the event type.

The eventName field tells what kind of change happened (INSERT, MODIFY, REMOVE) in the stream record.

2fill in blank

medium

Complete the code to get the new image of the changed item from the stream record.

DynamoDB

new_image = record['dynamodb']['[1]']

Drag options to blanks, or click blank then click option'

AOldImage

BKeys

CNewImage

DSequenceNumber

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'OldImage' will give the previous state, not the new one.

Using 'Keys' or 'SequenceNumber' does not provide the item data.

The NewImage contains the new state of the item after the change.

3fill in blank

hard

Fix the error in the code to check if the event is an INSERT.

DynamoDB

if record['eventName'] == '[1]':
    print('New item inserted')

Drag options to blanks, or click blank then click option'

AREMOVE

BINSERT

CUPDATE

DMODIFY

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'UPDATE' or 'MODIFY' instead of 'INSERT' will not detect new items.

Using 'REMOVE' checks for deletions, not insertions.

The event name for a new item added to the table is INSERT.

4fill in blank

hard

Fill both blanks to filter stream records for MODIFY events and get the old image.

DynamoDB

if record['[1]'] == 'MODIFY':
    old_image = record['dynamodb']['[2]']

Drag options to blanks, or click blank then click option'

AeventName

BNewImage

COldImage

DKeys

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'NewImage' instead of 'OldImage' will give the updated data, not the old.

Checking 'Keys' instead of 'eventName' will not filter events.

To check the event type, use eventName. For the previous state of the item, use OldImage.

5fill in blank

hard

Fill all three blanks to create a dictionary of item keys and their new values for INSERT events.

DynamoDB

if record['[1]'] == 'INSERT':
    new_image = record['dynamodb']['[2]']
    keys = {k: v['[3]'] for k, v in new_image.items()}

Drag options to blanks, or click blank then click option'

AeventName

BNewImage

CS

DOldImage

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'OldImage' instead of 'NewImage' will get old data.

Using 'N' or other keys instead of 'S' will not extract string values correctly.

Check event type with eventName, get new data from NewImage, and extract string values with 'S' from DynamoDB attribute maps.