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Home -> Community -> Mailing Lists -> Oracle-L -> RE: RMAN - Remote vs Local Backups
In my scenario, target DB to be backed up on box A and rman database/catalog on Box B, I can "run" the backup from A or from B no problem. But, what I'm trying to get at is it better, worse or indifferent to "run" the backup from B or A. I would think there is extra network traffic to "run" the backup from B.
DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM> wrote:Walter - What you describe is the standard RMAN configuration. Box B
contains the RMAN catalog, therefore it must command the backup. And so the
cron job must run on Box B. But the actual backup occurs on the target
machine (A in your example). If you back up to tape, you must have an MML
(Media Management Library). You can also back up to disk (that is what I
do).
Since the actual backup occurs on the target machine, not much network
traffic is involved. RMAN sends some commands, the target sends some status
back, and that is about it.
Dennis Williams
DBA, 80%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Thursday, May 29, 2003 4:30 PM
To: Multiple recipients of list ORACLE-L
Thanks Tim, Dennis and Ron for your feedback. I appreciate it.
Let me clarify what I'm seeking. In my example, I am using a centralized catalog which is on its own dedicated database/server and backups are to tape. BCV's are not involved.
Normally, in my experience, RMAN backups are initiated from the target server via a cron job. But, I've seen a case where a cron job for an RMAN backup was run from a box that was different from the database server machine. I find this configuration strange and confusing because it implies this was done for a "reason" and makes life difficult to find out where all the backups are running from.
In the scenario of backing up the database on box A via an rman/cron job on box B, is this particular configuration more network resource intensive and therefore slower versus the backup being initiated from the same machine as the database? If not, could someone explain why?
Does this make sense?
Thanks again.
-w
DENNIS WILLIAMS wrote:
Walter - As RMAN was introduced in Oracle8i, that was the ideal. I think
Oracle viewed RMAN as a high-level feature that would help you manage the
backups for large server farms. They emphasized that the catalog was the way
to go. With the catalog on another box, if the server was toasted, you could
slide another system into that spot and with a couple of RMAN commands you
could have that up and going again. Obviously if you use the catalog method
on the box you are backing up, you must have a second instance, and even
then you introduce more vulnerabilities than the configuration where the
catalog is on another server.
With Oracle9i, Oracle added many of the features that were only
available in the catalog method to the control-file method. According to my
Oracle Education Instructor John Hibbard who is pretty plugged into these
things, Oracle is trying ! to emphasize that the catalog method may not suit
everyone's situation and the control file method may best suit your needs.
As others on this list have pointed out, not all conference speakers have
gotten that message.
Dennis Williams
DBA, 80%OCP, 100% DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com
-----Original Message-----
Sent: Thursday, May 29, 2003 11:55 AM
To: Multiple recipients of list ORACLE-L
Hi,
Can anyone think of a reason(s) why one WOULD want to backup a database from a box other than the database box itself? Are there any advantages to this kind of configuration?
For example:
Box-A (production db server)
Box-B (rman db server)
A cron job runs on Box-B which backups up the database from Box-A.
Thanks in advance!
-w
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Author: DENNIS WILLIAMS
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Author: Walter K
INET: ora1034_at_sbcglobal.net
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