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layout: article layout: article
title: Data Restore title: Data Restore
description: How to restore a previous version of a Data Controller table description: How to restore a previous version of a Data Controller table
og_image: https://docs.datacontroller.io/img/restore.png
--- ---
# Data Restore # Data Restore
@ -10,6 +11,8 @@ For those tables which have [Audit Tracking](/dcc-tables/#audit_libds) enabled,
Simply open the submit to be reverted, and click the red REVERT button. This will generate a NEW submission, containing the necessary reversal entries. This new submission **must then be approved** in the usual fashion. Simply open the submit to be reverted, and click the red REVERT button. This will generate a NEW submission, containing the necessary reversal entries. This new submission **must then be approved** in the usual fashion.
![](/img/restore.png)
Note that there are some caveats to this feature: Note that there are some caveats to this feature:
- It will only work for TXTEMPORAL and UPDATE Load Types - It will only work for TXTEMPORAL and UPDATE Load Types
@ -19,3 +22,8 @@ Note that there are some caveats to this feature:
- If the model has changed (new / deleted columns) the restore will abort - If the model has changed (new / deleted columns) the restore will abort
- Only submissions that have actually been loaded, can be reverted (obviously) - Only submissions that have actually been loaded, can be reverted (obviously)
## Technical Information
The restore works by undoing all the changes listed in the [MPE_AUDIT](/tables/mpe_audit/) table. The keys from this table (since and including the version to be restored) are left joined to the base table (to get current values) to create a staging dataset, and then the changes applied in reverse chronological order using [this macro](https://core.sasjs.io/mp__stripdiffs_8sas.html).
Source code for the restore process is available here: https://git.datacontroller.io/dc/dc/src/branch/main/sas/sasjs/services/editors/restore.sas