Hi Terry:

Your command will just truncate the transaction log. Basically, this will only free up space used by the log for committed transactions, and does not perform a backup. If that is your purpose (truncating the log), you do not need to specify the backup device. You can run...

BACKUP LOG mydatabase WITH TRUNCATE_ONLY

If you want to back up the transaction log, you should not specify TRUNCATE_ONLY. Basically, the statement may look something like

BACKUP LOG mydatabase TO mydatalog

Before you run this, make sure the backup device mydatalog already exists. If not, create it using the system stored procedure SP_ADDUMPDEVICE. You need to create it only once. Your error message suggests mydatalog is still not created.

Hope this helps...

>Besides the maintenance plan wizard which I've put into action, how with query do I >execute a backup of log?

>I try:

>backup log mydatabase to mydatalog with TRUNCATE_ONLY

>but it doesn't like the mydatalog part.

>something about sysdevices does not recognize the mydatalog.