TTL attribute setup in DynamoDB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does TTL stand for in DynamoDB?

TTL stands for Time To Live. It is a feature that automatically deletes expired items from a DynamoDB table.

beginner

How do you enable TTL on a DynamoDB table?

You enable TTL by specifying a TTL attribute name in the table settings. This attribute stores the expiration time as a Unix timestamp.

beginner

What type of value should the TTL attribute hold?

The TTL attribute should hold a Unix epoch timestamp in seconds, indicating when the item should expire.

intermediate

Does DynamoDB delete expired items immediately after the TTL timestamp?

No, DynamoDB deletes expired items within 48 hours after the expiration time. The deletion is eventually consistent.

intermediate

Can you use TTL on any attribute in DynamoDB?

No, TTL must be enabled on a single attribute per table, and that attribute must contain the expiration timestamp.

What data type should the TTL attribute in DynamoDB be?

A Unix timestamp in seconds

B Boolean true/false

C String containing a date

D ISO 8601 formatted string

The TTL attribute must be a Unix timestamp in seconds representing the expiration time.

When does DynamoDB remove expired items after the TTL timestamp?

A Within 48 hours after expiration

B Only when manually deleted

C After 7 days

D Immediately at the timestamp

DynamoDB removes expired items within 48 hours after the TTL timestamp, not immediately.

How many TTL attributes can you enable per DynamoDB table?

A Two

B One

C Unlimited

D None

You can enable TTL on only one attribute per DynamoDB table.

What happens if the TTL attribute is missing or empty for an item?

A Item causes an error

B Item expires immediately

C Item is deleted after 24 hours

D Item never expires

If the TTL attribute is missing or empty, the item does not expire.

Which of the following is required to enable TTL on a DynamoDB table?

A Set a read capacity unit

B Create a global secondary index

C Specify the TTL attribute name

D Enable encryption

You must specify the TTL attribute name to enable TTL on a DynamoDB table.

Explain how to set up TTL on a DynamoDB table and what type of data the TTL attribute should contain.

Think about the attribute name and the format of the expiration time.

Describe what happens to items in DynamoDB after their TTL expiration time passes.

Consider the timing and consistency of the deletion process.