DynamoDB TTL Exam Tips
DynamoDB Time To Leave (TTL)
- Time to leave attribute defines an expiry time for your data
- Expired items marked for deletion
- Great for removing irrelevant or old data
- Session data
- Event logs
- Temporary data
- Reduce4s cost by automatically removing data which is no longer relevant
Session Data Table
| userId | sessionId | creationTime | expirationTime(TTL) | sessionData |
|---|---|---|---|---|
| 12341234 | 23458123458 | 1544016418 | 1544023618 | {JSON} |
| 82384283 | 82384238482 | 1544013196 | 1544020396 | {JSON} |
| 34856723 | 72374823932 | 1544030827 | 1544038027 | {JSON} |
| 72374271 | 82138428348 | 1544002027 | 1544009227 | {JSON} |
- TTL expressed as EPOCH time Epoch Converter
- Expiration is set for 2 hours after the session began
- When the current time is greater than the TTL, the item will be expired and marked for deletion
- You can filter out expired items from your queries and scans
- Once marked for deletion, items are deleted with 24 hours