Consistent vs eventually consistent reads in DynamoDB - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to perform a strongly consistent read in DynamoDB.

DynamoDB

response = table.get_item(Key={'id': '123'}, ConsistentRead=[1])

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

ATrue

BFalse

C'True'

D'False'

Attempts:

3 left

💡 Hint

Common Mistakes

Using string 'True' instead of boolean True

Setting ConsistentRead to False expecting strong consistency

Setting ConsistentRead=True ensures a strongly consistent read in DynamoDB.

2fill in blank

medium

Complete the code to perform an eventually consistent read in DynamoDB.

DynamoDB

response = table.get_item(Key={'id': '456'}, ConsistentRead=[1])

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

A'False'

BFalse

C'True'

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using string 'False' instead of boolean False

Setting ConsistentRead to True expecting eventual consistency

Setting ConsistentRead=False or omitting it performs an eventually consistent read.

3fill in blank

hard

Fix the error in the code to correctly request a consistent read.

DynamoDB

response = table.get_item(Key={'id': '789'}, ConsistentRead=[1])

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

A'true'

B'False'

CTrue

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or string values for ConsistentRead

Confusing string and boolean types

The ConsistentRead parameter must be a boolean True, not a string or lowercase.

4fill in blank

hard

Fill both blanks to perform a query with a consistent read.

DynamoDB

response = table.query(KeyConditionExpression=Key('userId').eq('user123'), [1]=[2])

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

AConsistentRead

BFilterExpression

CTrue

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using FilterExpression instead of ConsistentRead for consistency

Setting ConsistentRead to False expecting strong consistency

Use ConsistentRead=True to get a strongly consistent query result.

5fill in blank

hard

Fill all three blanks to create a strongly consistent scan with a filter expression.

DynamoDB

response = table.scan([1]=[2], [3]=Attr('status').eq('active'))

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

AConsistentRead

BTrue

CFilterExpression

DFalse

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up FilterExpression and ConsistentRead parameters

Using False instead of True for ConsistentRead

Use ConsistentRead=True and FilterExpression to scan with strong consistency and filter results.