Limit and pagination in DynamoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to limit the number of items returned to 5.

DynamoDB

response = table.scan(Limit=[1])

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

A0

B10

C5

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number larger than needed.

Setting Limit to 0 which returns no items.

The Limit parameter controls how many items DynamoDB returns in one call. Setting it to 5 returns only 5 items.

2fill in blank

medium

Complete the code to start scanning from the last evaluated key stored in last_key.

DynamoDB

response = table.scan(ExclusiveStartKey=[1])

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

Alast_key

B{}

CNone

Dstart_key

Attempts:

3 left

💡 Hint

Common Mistakes

Passing None which means start from the beginning.

Using a wrong variable name.

The ExclusiveStartKey parameter tells DynamoDB where to continue scanning from. You pass the last key you got from the previous scan.

3fill in blank

hard

Fix the error in the code to correctly check if there are more items to scan.

DynamoDB

if 'LastEvaluatedKey' in response and response[1] 'LastEvaluatedKey' is not None:
    last_key = response['LastEvaluatedKey']

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

Ais

B==

Cnot in

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using == which checks equality, not inequality.

Using is which is not correct for this check.

You want to check that LastEvaluatedKey exists and is not None. Using != correctly tests that.

4fill in blank

hard

Fill both blanks to scan with a limit of 10 and start from the last evaluated key.

DynamoDB

response = table.scan(Limit=[1], ExclusiveStartKey=[2])

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

A10

Blast_key

C5

D{}

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong limit values.

Not passing the correct start key variable.

Set Limit to 10 to get 10 items per scan, and use last_key to continue from where the last scan ended.

5fill in blank

hard

Fill all three blanks to create a loop that paginates through all items with a limit of 3.

DynamoDB

last_key = None
items = []
while True:
    response = table.scan(Limit=[1], ExclusiveStartKey=[2])
    items.extend(response['Items'])
    if 'LastEvaluatedKey' not in response or response['LastEvaluatedKey'] is None:
        break
    last_key = response[[3]]

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

A3

Blast_key

C'LastEvaluatedKey'

D'Items'

Attempts:

3 left

💡 Hint

Common Mistakes

Not updating last_key correctly.

Using wrong keys or limit values.

This loop scans the table in pages of 3 items. It uses last_key to continue scanning and stops when no more keys are returned.