Parallel scan in DynamoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a parallel scan with 4 segments.

DynamoDB

response = table.scan(Segment=[1], TotalSegments=4)

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A1

B4

C5

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using Segment=4 which is out of range.

Starting Segment count at 1 instead of 0.

The Segment parameter starts from 0 up to TotalSegments - 1. So the first segment is 0.

2fill in blank

medium

Complete the code to specify the total number of segments for a parallel scan.

DynamoDB

response = table.scan(Segment=2, TotalSegments=[1])

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A4

B2

C1

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Setting TotalSegments less than or equal to Segment.

Using TotalSegments=1 for parallel scan which defeats the purpose.

TotalSegments defines how many segments the table is divided into for parallel scanning. It must be at least 1.

3fill in blank

hard

Fix the error in the parallel scan code by completing the missing parameter.

DynamoDB

response = table.scan(Segment=1, TotalSegments=3, [1]=True)

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AParallelScan

BConsistentRead

CExclusiveStartKey

DReturnConsumedCapacity

Attempts:

3 left

💡 Hint

Common Mistakes

Using ParallelScan as a parameter which does not exist.

Confusing ExclusiveStartKey with consistency setting.

ConsistentRead=True ensures strongly consistent reads during the scan.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps segment numbers to their scan results.

DynamoDB

results = {segment: table.scan(Segment=[1], TotalSegments=[2]) for segment in range(4)}

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Asegment

B4

C3

Dsegment + 1

Attempts:

3 left

💡 Hint

Common Mistakes

Using segment + 1 for Segment which goes out of range.

Setting TotalSegments less than the range count.

The segment variable is used for the Segment parameter, and TotalSegments is 4 to match the range.

5fill in blank

hard

Fill all three blanks to filter scan results for items with attribute 'status' equal to 'active' in each segment.

DynamoDB

filtered = {seg: [item for item in table.scan(Segment=[1], TotalSegments=[2])['Items'] if item.get('[3]') == 'active'] for seg in range(3)}

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Aseg

B3

Cstatus

Dsegment

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'segment' instead of 'seg' causing undefined variable error.

Filtering by wrong attribute name.

Use 'seg' for Segment, 3 for TotalSegments, and 'status' as the attribute to filter by.