# Ignition Edge historian limitations

**URL:** <https://forum.inductiveautomation.com/t/ignition-edge-historian-limitations/33775>\
**Category:** Ignition\
**Created:** [April 8, 2020, 11:06am UTC](https://forum.inductiveautomation.com/t/ignition-edge-historian-limitations/33775 "2020-04-08T11:06:53Z")\
**Posts on this page:** 3\
**Page:** 3

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**Author:** ![Andre\_Hennecke](https://avatars.discourse-cdn.com/v4/letter/a/e95f7d/32.png) [@Andre\_Hennecke](https://forum.inductiveautomation.com/u/Andre_Hennecke)\
**Post date:** [October 1, 2025, 9:17am UTC](https://forum.inductiveautomation.com/t/ignition-edge-historian-limitations/33775/41 "2025-10-01T09:17:05Z")

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Hi,

do you are aware how Alarm and Audit Logs are impacted by the 10 million data points limitation on the edge:

**The documentation says:**

- **Tag History** - Up to 35 days or 10 million data points of history can be stored locally. Pruning will automatically happen, and the historian is automatically enabled and not configurable. You can learn more about Tag History **[here](https://www.docs.inductiveautomation.com/docs/8.3/ignition-modules/tag-historian/tag-history-providers)**.

- **Alarm Journal** - The Alarm Journal will store all alarm events locally for one week of events. There are limited configuration options; the Alarm Journal can be accessed via the Edge Alarm Journal profile.

- **Audit Logs** - Like the Alarms, the Audit log is limited to one week of local storage. It is not configurable.

Based on this I would assume, that Alarm Journal and Audit Logs are not deleted, even if we have 10 million data points in the storage?

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<div class="post-metadata">

**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\
**Post date:** [October 1, 2025, 3:24pm UTC](https://forum.inductiveautomation.com/t/ignition-edge-historian-limitations/33775/42 "2025-10-01T15:24:17Z")

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Edge's alarm journal and audit log storage are separate from the historian and only prune based on time.

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<div class="post-metadata">

**Author:** ![Andre\_Hennecke](https://avatars.discourse-cdn.com/v4/letter/a/e95f7d/32.png) [@Andre\_Hennecke](https://forum.inductiveautomation.com/u/Andre_Hennecke)\
**Post date:** [October 2, 2025, 3:52pm UTC](https://forum.inductiveautomation.com/t/ignition-edge-historian-limitations/33775/43 "2025-10-02T15:52:23Z")

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Thank you for the clarification!

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