Re: Rman - Curious Question

amerar_at_iwc.net wrote:
> Hi All,
>
> Just a curious question:
>
> When you are duplicating a database which is on a differnt host, why
> does it require you to copy the files to the remote host? Why can't
> RMAN use the files on the primiary host?
>
> If you are using a recovery catalog, you use the catalog on the primary
> host, so, why not also use the backup pieces? All the manual says is
> that it requires you to copy the file.....
>

There is (at least) one misconception in your post: The catalog does only hold metainformation about the backups, so the fact that it is accessible is rather irrelevant for the question why the backup pieces ain't used. (In fact, it is recommended that the catalog and the target database are on different HW, so the files wouldn't be accessible through the catalog db).

So the backup files are accessible primarily through the target - except if they are on tape and both machines can access the tape library - except if they are on a filesystem accessible to both machines.

Why does Oracle not use Net 8? Because RMAN creates a server process on the target db and no-one in their right minds would like the production server to flood his network interface with the 1 TB you mention later in this thread.

I hope this clears the smoke

Holger Received on Thu Jul 28 2005 - 02:45:25 CDT