Mensagem enviada por Tim Hunt

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For info, the correct English translation for words like 'questionnaire' (French), 'questionário' (Portugese) is 'Quiz'. In English/Moodle, 'Questionnaire' is something else (https://moodle.org/plugins/mod_questionnaire). This is undertandably confusing for speakers of Romance languages (and I could not immediately find which Spanish word, if any, causes the confusion).

Anyway, this issue is MDL-85510. A fix is being worked on.
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Also work asking:

Is the performance issue really caused by anything quiz-related? Or is the issue acutally to do with all the students Logging in to get started.

Moodle login is another thing that is qutie heavy-weight, because starting the user's session does a lot of things like pre-loading a lot of permission information, to make everything that follows faster.
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The real error is the "Exception - Attempt to assign property "subquestions" on false" one. (The message about temptables is just something that happens whenever an error occures in the middle of a backup/restore, and is not the real problem.)

ddmatch is a third-party question type. I don't know much about it - but the problem might not be that. The problem might be unexpected data in your database.