Deleting Tags Permanently

About this task

Historian allows you to delete and permanently delete tags. When a tag is deleted, it is removed from the tag database, but all data for that tag is retained in the archive and the tag name cannot be re-used. When a tag is permanently deleted, all the data for that tag is removed from the archive and the tag name is available for reuse. For more information, see Deleting Tags.
CAUTION: When a tag is permanently deleted, you can no longer query the data for that tag, since the data was removed from the archive.

Procedure

  1. In the Tag Maintenance screen, select a tag from the list in the left side of the screen.
    The tag information for that tag fills in the right-hand column.
  2. Click Delete.
    The Delete Tag dialog box appears as shown in the following figure.

  3. Select the Permanently Remove Tags From System option and click OK.
    A message box appears asking you to confirm the deletion.
  4. 4. Click Yes to permanently delete the tag.
    The tag is removed from the Tag Database. The tag data is removed from the archive. The tag name is now available for re-use.