# Clear undo history

```
 Action    name: ResetUndo
 
```

This command clears the undo history. After it the Undo and Redo commands become unavailable. However, once the user performs a new action, IDA will again start journaling all database modifications.

A side effect of this command is fast autoanalysis: since there is no user action to revert yet, IDA does not maintain undo buffers and this speeds up the analysis.

See also

* [Undo](https://docs.hex-rays.com/8.5/user-guide/user-interface/menu-bar/edit/undo-an-action)
* [Redo](https://docs.hex-rays.com/8.5/user-guide/user-interface/menu-bar/edit/redo-an-action)
* [Disable Undo](https://docs.hex-rays.com/8.5/user-guide/user-interface/menu-bar/edit/disable-undo)
* [Open undo history](https://docs.hex-rays.com/8.5/user-guide/user-interface/view/open-subviews#show-undo-history)