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* [Does NATS support replay/redelivery of historical data?](faq.md#does-nats-support-replayredelivery-of-historical-data) * [Does NATS support replay/redelivery of historical data?](faq.md#does-nats-support-replayredelivery-of-historical-data)
* [How do I gracefully shut down an asynchronous subscriber?](faq.md#how-do-i-gracefully-shut-down-an-asynchronous-subscriber) * [How do I gracefully shut down an asynchronous subscriber?](faq.md#how-do-i-gracefully-shut-down-an-asynchronous-subscriber)
* [How do I create subjects?](faq.md#how-do-i-create-subjects) * [How do I create subjects?](faq.md#how-do-i-create-subjects)
* [Does adding a “max_age” to a “channel” for NATS streaming server connected to a SQL store, retroactively delete messages?](faq.md#does-adding-a-maxage-to-a-channel-for-nats-streaming-server-connected-to-a-sql-store-retroactively-delete-messages)
## General ## General
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Subjects are created and pruned \(deleted\) dynamically based on interest \(subscriptions\). This means that a subject does not exist in a NATS cluster until a client subscribes to it, and the subject goes away after the last subscribing client unsubscribes from that subject. Subjects are created and pruned \(deleted\) dynamically based on interest \(subscriptions\). This means that a subject does not exist in a NATS cluster until a client subscribes to it, and the subject goes away after the last subscribing client unsubscribes from that subject.
### Does adding a “max_age” to a “channel” for NATS streaming server connected to a SQL store, retroactively delete messages?
Yes, any channel limit will be applied on startup. For more information, see [Store Limits](nats-streaming-server/configuring/storelimits.md#limits-are-retroactive).