Mauro do Carmo wrote:
However, could one delete completely the revisions so that they would not be kept in the database? I mean delete completely the content of 'Old table' of a deleted page.
MediaWiki is designed to retain data, so actions can be cleanly undone.
If you for some reason need to permanently remove things from the database, you can manipulate the database in MySQL directly. See maintenance/tables.sql for the annotated schema definitions.
-- brion vibber (brion @ pobox.com)