Manual:PopulateArchiveRevId.php

Details
populateArchiveRevId.php populates  field in old rows.

When revisions are deleted, their unique rev_id is stored in table so it can be retained after undeletion. This is necessary to retain permalinks to given revisions after accidental delete cycles or messy operations like history merges. Old entries from MediaWiki 1.4 will be NULL, and a new rev_id will be created on undeletion for those revisions.

This script runs by default when you runs. It processes 100 items in every batch.

Options
This script does not take any option.