As admin I received this mail from our server:
Insert into log table failed at Monday 20th of December 2010 10:06:57 AM.
It is possible that your disk is full.
The failed query parameters are:
'time' => 1292836017,
'userid' => '434',
'course' => '88',
'ip' => '126.96.36.199',
'module' => 'quiz',
'cmid' => '3381',
'action' => 'continue attempt',
'url' => 'review.php?attempt=329000',
'info' => '1141',
The disk can not be full!