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[Mahara Bot <1400524@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://reviews.mahara.org/4069
Committed: http://gitorious.org/mahara/mahara/commit/3fc71a298c400a2e760255b7ac7b74f8e0042444
Submitter: Son Nguyen (son.nguyen@xxxxxxxxxxxxxxx)
Branch:    master

commit 3fc71a298c400a2e760255b7ac7b74f8e0042444
Author: Aaron Wells <aaronw@xxxxxxxxxxxxxxx>
Date:   Tue Dec 9 14:37:33 2014 +1300

Performance improvements for the code that fills in artefact.path

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 separately handling
the simpler case of parentless artefacts, and by removing
a redundant "select * from artefact"

Change-Id: Iddcfea3161fbfe804ec808119fe771757e7cdd5e

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https://bugs.launchpad.net/bugs/1400524

Title:
  Upgrading from 1.7 to 1.10 failed in big databases

Status in Mahara ePortfolio:
  In Progress
Status in Mahara 1.10 series:
  New

Bug description:
  Version: 1.10, and master(15.04)
  Platform: apache, postgres

  In big database, the upgrading has been failed when updating artefact table
  htdocs/lib/db/upgrade.php: 3255-3284

  This process should be done in chunks as the the table 'artefact' may
  be big which will causes exceed execution time.

  See also: Bug #1298646

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