Manual:PopulateRevisionLength.php/en

Details
populateRevisionLength.php file is a maintenance script to populate the  and   fields for old revisions created before MW 1.10.

The and  fields contain the length of the article in bytes after a new revision or deletion.

This script runs by default when you run. It processes 200 items in a batch.

Options/Arguments
This script does not take any options or arguments.