AWS - DynamoDB
You want to store session data that expires exactly 30 minutes after creation using DynamoDB TTL. Which approach correctly sets the TTL attribute?
You want to store session data that expires exactly 30 minutes after creation using DynamoDB TTL. Which approach correctly sets the TTL attribute?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Calculate TTL value correctly
TTL attribute must be a Number in seconds, so add 1800 seconds (30 minutes) to current epoch seconds.Step 2: Eliminate incorrect formats
ISO strings, Booleans, or milliseconds are invalid for TTL attribute in DynamoDB.Final Answer:
Set TTL attribute to current Unix epoch time in seconds plus 1800 seconds -> Option AQuick Check:
TTL = epoch seconds + 1800 [OK]
Quick Trick: TTL value = current epoch seconds + 1800 for 30 minutes [OK]
Common Mistakes:
MISTAKES- Using ISO date strings instead of epoch seconds
- Using milliseconds instead of seconds
- Setting TTL as Boolean instead of number
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