LGWR: terminating instance due to error 340 - What's the cause?

Gentlepersons:

One of my Oracle instances has started shutting itself down, and I haven't been able to determine the reason. I'm hoping someone here will recognize the symptoms and point me in the right direction. Here are extracts from the alert log for the four times this has happened:

    Tue Jan 11 11:53:06 2000
    LGWR: terminating instance due to error 340     Instance terminated by LGWR, pid = 471

    Fri Jan 21 10:05:53 2000
    Thread 1 advanced to log sequence 16165

        Current log# 1 seq# 16165 mem# 0: D:\ORANT\DATABASE\LOG2ORCL.ORA     LGWR: terminating instance due to error 340     Instance terminated by LGWR, pid = 379

    Wed Jan 26 12:55:51 2000
    LGWR: terminating instance due to error 340     Wed Jan 26 12:55:52 2000
    Errors in file D:\ORANT\RDBMS80\trace\ORA00612.TRC:     ORA-00340: IO error processing online log of thread     Instance terminated by LGWR, pid = 514

    Wed Mar 01 14:46:56 2000
    LGWR: terminating instance due to error 340     Wed Mar 01 14:46:57 2000
    Errors in file D:\ORANT\RDBMS80\trace\ORA00514.TRC:     ORA-00340: IO error processing online log of thread     Instance terminated by LGWR, pid = 462

The Oracle documentation on this is very vague:

    Cause: An IO error occurred on the named online log.     Action: Restore accessibility to file, or restore file from backup.

There's no evidence that the log files are presenting any accessibility problems. The database uses four log files; the first two are 200K, while the last two are 10MB. This is an 8.0.5 installation running on NT. I've examined the server's event log and did not find any events that systematically happen just before the database is brought down.

Anyone have an idea what's causing this?

Thanks. Received on Thu Mar 02 2000 - 00:00:00 CST