[MDL-9838] Large number of quiz attempts (effectively) break backup - Moodle Tracker

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Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Duplicate
Affects Version/s: 1.6.5
Fix Version/s: None
Component/s: Backup, Quiz
Labels:
None

Affected Branches:
MOODLE_16_STABLE

Description

I've been unable to verify if this problem persists in newer versions that 1.6.5 - but I should be able to soon

If a course has a large (but not ridiculous) number of quiz attempts (order of 1000 for a quiz with about 25 questions) backup and/or restore is severely compromised. It seems that building the XML for those attempts burns up crazy amounts of memory (we went up to half a gig before giving up). A similar problem is exhibited trying to restore the file - this has been verified as a problem in 1.8 STABLE.

IMHO, backup and restore shouldn't ever use that amount of memory, although I appreciate the solution will be complex.

Attachments

Issue Links

has a non-specific relationship to

MDL-14302 Course Restore Fails with Heavy User Data

Closed

will be (partly) resolved by

MDL-15489 Restore fails: Could not restore modules!

Closed

MDL-14269 META: Backup performance

Closed

Activity

People

Assignee:: Eloy Lafuente (stronk7)

Reporter:: Howard Miller

Participants:: Dan Marsden, Eloy Lafuente (stronk7), Howard Miller, Tim Hunt

Component watchers:: Adrian Greeve, David Woloszyn, Huong Nguyen, Jake Dallimore, Meirza, Michael Hawkins, Raquel Ortega, Safat Shahin, Stevani Andolo, Tim Hunt, Ilya Tregubov, Kevin Percy, Mathew May, Mihail Geshoski, Shamim Rezaie

Votes:: 2 Vote for this issue

Watchers:: 3 Start watching this issue

Dates

Created:: 18/May/07 2:24 AM

Updated:: 02/Mar/09 4:49 PM

Resolved:: 02/Mar/09 4:49 PM