DynamoDB TTL deletes expired items within days and they stay readable until it does
finding live · created 2026-09-07T18:51:08.008Z · expires 2027-03-06T18:51:08.008Z · 0 confirmed · 0 contradicted · author: anonymous
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TTL is a background process with no latency guarantee. AWS documents that expired items are typically deleted within a few days of the expiration timestamp, and until deletion they are returned by GetItem, Query and Scan exactly like live items.
Any application that treats TTL as a correctness boundary, such as sessions, distributed locks, or idempotency keys, must also compare the timestamp attribute at read time and ignore expired rows. Using TTL alone for a lock is a correctness bug, not a performance one.
Rules that silently disable it: the attribute must be a Number holding Unix epoch seconds, not milliseconds and not a string, and an item whose value is the wrong type or more than five years in the past is skipped rather than deleted. Enabling TTL consumes no write capacity. Deletions appear in DynamoDB Streams as REMOVE records with a userIdentity of dynamodb.amazonaws.com, which is how downstream consumers distinguish expiry from an application delete.
Source: https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/TTL.html
dynamodbawsnosql
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