7 Commits

Author	SHA1	Message	Date
Mark Johnson	07a6698d01	MDL-79639 quiz_statistics: Prevent database deadlocks ... This changes the cache purge code to select IDs for deletion first, rather than using a subquery in a DELETE, since this risks causing a deadlock in MySQL.	2023-10-19 08:57:34 +01:00
Tim Hunt	60dbaa0065	MDL-75576 quiz/question statistics: don't expire by time ... Previously, a set of calculated quiz statistics would only 'last' for 15 minutes. Then they would be considered invalid and not used. Now, computed statistics are kept indefinitely. Instead, when a new batch of values are computed for a particular set of settings, older numbers for the same settings are deleted first. Therefore, question_stats_cleanup_task is no more.	2023-05-15 10:01:27 +01:00
Tim Hunt	bccad386b0	MDL-61077 question stats: make calculations more robust	2018-01-15 16:07:57 +00:00
James Pratt	038014c415	MDL-41760 quiz_statistics : response analysis for first/last/all tries	2014-03-18 18:47:19 +07:00
James Pratt	4922e79f3e	MDL-41759 quiz statistics : break down responses for each variant	2014-02-14 15:23:04 +07:00
Dan Poltawski	472c06f816	MDL-42546 question: fix some bad phpdocs	2013-11-01 12:06:43 +08:00
Jamie Pratt	d50b05e696	MDL-41751 changes to api of question_response_analyser ... and code refactoring and clean up.	2013-09-27 17:38:13 +07:00