TTL behavior and timing in DynamoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the TTL attribute name in DynamoDB.

DynamoDB

ttl_spec = {"AttributeName": "[1]", "Enabled": true}

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

AExpirationTime

BTTL

CTimeToLive

DDeleteAt

Attempts:

3 left

💡 Hint

Common Mistakes

Using attribute names not recognized by DynamoDB for TTL.

Forgetting to enable TTL after setting the attribute name.

The TTL attribute name is usually set to "TTL" in DynamoDB to mark the expiration timestamp.

2fill in blank

medium

Complete the code to enable TTL on a DynamoDB table using AWS CLI.

DynamoDB

aws dynamodb update-time-to-live --table-name MyTable --time-to-live-specification Enabled=[1],AttributeName=TTL

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

Atrue

Bfalse

Cenabled

Dyes

Attempts:

3 left

💡 Hint

Common Mistakes

Using string values like 'yes' or 'enabled' instead of boolean true.

Setting Enabled to false disables TTL.

To enable TTL, the Enabled flag must be set to true.

3fill in blank

hard

Fix the error in the TTL attribute value type for DynamoDB items.

DynamoDB

item = {"UserId": "123", "TTL": [1]

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A"2024-06-01T00:00:00Z"

B"1685606400"

C1685606400

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using ISO date strings instead of epoch seconds.

Using string type for the timestamp instead of number.

The TTL attribute must be a number representing the Unix epoch time in seconds.

4fill in blank

hard

Fill both blanks to explain when expired items are deleted by DynamoDB TTL.

DynamoDB

Expired items are typically deleted within [1] hours, but actual deletion can take up to [2] hours.

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

A48

B72

C24

D96

Attempts:

3 left

💡 Hint

Common Mistakes

Assuming immediate deletion right after expiration.

Confusing hours with minutes or days.

DynamoDB usually deletes expired items within 24 hours, but it can take up to 72 hours in some cases.

5fill in blank

hard

Fill all three blanks to describe TTL behavior and timing in DynamoDB.

DynamoDB

TTL attribute must be a [1] representing epoch time in seconds. DynamoDB checks for expired items approximately every [2] minutes. Deletion of expired items can take up to [3] hours.

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

Anumber

Bstring

C5

D48

Attempts:

3 left

💡 Hint

Common Mistakes

Using string type for TTL attribute.

Thinking TTL checks happen instantly or only once a day.

The TTL attribute is a number (epoch seconds). DynamoDB scans for expired items roughly every 5 minutes. Deletion can take up to 48 hours.