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* [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)
* [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-max_age-to-a-channel-for-nats-streaming-server-connected-to-a-sql-store-retroactively-delete-messages)
* [What is the upgrade path from NATS 1.x to 2.x?](faq.md#what-is-the-upgrade-path-from-nats-1.x-to-2.x)
## General
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Yes, any channel limit will be applied on startup. For more information, see [Store Limits](nats-streaming-server/configuring/storelimits.md#limits-are-retroactive).
### What is the upgrade path from NATS 1.x to 2.x?
NATS 2.0 is completely backwards compatible with NATS < 2.x configure files and clients. Just run the new server. Be sure to review the [What's New in 2.0](whats_new_20.md) for great new features.