Has the script been confirmed as safe to run under, e.g., 1.11?
Emufarmers Sangly wrote:
If you're sure you want to delete all old
revisions, and you've
cleared any potential licensing issues (if your wiki is licensed under
a Creative Commons license or the GDFL, you'll probably be violating
the terms of the license if you fail to attribute all edits), then you
can run the maintenance script called deleteOldRevisions.php.
<http://www.mediawiki.org/wiki/Manual:Maintenance_scripts>