Permanently Deleting Models and Data Files
You can permanently delete versions of models and data files in a Model Manager database as a way of reducing disk space usage. You may, for example, want to get rid of old drafts that you no longer have any use for or some particular version that is unsuitable to keep in the database.
Beware that permanently deleted versions cannot be recovered unless you have a backup of your database.
You can permanently delete versions of models and files by:
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Right-clicking versions in the The Versions Window for an item and selecting Permanently Delete ().
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Select one of the options in the Permanently Delete menu () on The Maintenance Toolbar, which is available for versions in The Maintenance Window when the window is focused.
Since Model Manager does not duplicate unchanged data when saving versions of a model, do not be surprised if permanently deleting a single version does not reclaim much disk space.
Permanently deleting versions will remove most traces of them ever existing in the database. If you find, for example, a commit for which the Changes table is surprisingly empty in The Commit Details Dialog Box, chances are that this commit involved saving a version that now has been permanently deleted. The commit comment, if any, may give a clue of what saving that version entailed.
Permanently Deleting Versions as a Maintenance Operation