Comment 7 for bug 1400524

Reviewed: https://reviews.mahara.org/4072
Committed: http://gitorious.org/mahara/mahara/commit/31a1931435e4cd1e9489c1814a42e9ae96c6490d
Submitter: Aaron Wells (<email address hidden>)
Branch: master

commit 31a1931435e4cd1e9489c1814a42e9ae96c6490d
Author: Aaron Wells <email address hidden>
Date: Tue Dec 9 14:37:33 2014 +1300

Even quicker way to fill in artefact paths

Bug 1400524: On a large site, the database queries to retrieve
all records from the artefact table can take too long to execute
and cause the PHP script to time out.

This optimization attempts to fix that by filling in the paths
with an iterative series of UPDATE queries instead.

Change-Id: I46c13cc97bac8a6d2bc626e3b2dc8e4cdeecd2bb