Hi, Database crashed with the Below error Tue Jun 15 23:01:05 2008 USER: terminating instance due to error 472 Instance terminated by USER, pid = 23881 Wed Jun 16 00:17:47 2008 The instance gets crashed mostly every week and the alert log shows ---------------------------------------------------- Fri May 9 23:01:05 2008 USER: terminating instance due to error 472 Instance terminated by USER, pid = 29028 Mon Jun 2 23:01:04 2008 USER: terminating instance due to error 472 Instance terminated by USER, pid = 1400 Tue Jun 10 23:01:05 2008 USER: terminating instance due to error 472 Instance terminated by USER, pid = 23881 ---------------------------------------------------- Also it's very interesting that the time is identical on the instance failures (23:01 ) i have also checked OS logs. But i could not find any relative information related to the instance crashed on that particular time. Kindly advice if any one come across this issue Thanks,