Earlier today, one of my databases just stopped running without any reason. I have checked the tablespace storage, there is bags of room, any ideas what else I could check to see why this has happened, here is the extract from the alert files, by the way its 7.3.3 running on NT 4.0 :
(times are GMT)

Fri Jan 12 12:30:22 2001
Shutting down instance (immediate)
License high water mark = 9
Fri Jan 12 12:30:26 2001
ALTER DATABASE CLOSE NORMAL
Fri Jan 12 12:30:26 2001
SMON: disabling tx recovery
SMON: disabling cache recovery
Fri Jan 12 12:30:28 2001
Thread 1 closed at log sequence 2506
Current log# 2 seq# 2506 mem# 0: C:\ORANT\DATABASE\LOG2FLVE.ORA
Fri Jan 12 12:30:28 2001
Completed: ALTER DATABASE CLOSE NORMAL
Fri Jan 12 12:30:28 2001
ALTER DATABASE DISMOUNT
Completed: ALTER DATABASE DISMOUNT
Dump file C:\ORANT\RDBMS73\trace\flveALRT.LOG