From config.php ::
//This should be right for 99% of servers
When is it right to set this to "false" ?
As I found out a few weeks ago students get frequent db-related error messages (and complain about it ) when they hit the system simultanously (just before due date of assignment). Just set dbpersist=false when the problem occurs and the effect is immediate (we didn't even have any problems with lost data).