Thanks a lot Hans. That picture clears up the question of data flow. Data
goes directly from DB server to media server.
On Wed, Apr 22, 2015 at 10:06 AM, Hans Forbrich <fuzzy.graybeard@xxxxxxxxx>
wrote:
On 22/04/2015 8:41 AM, Mladen Gogala (Redacted sender mgogala@xxxxxxxxx
for DMARC) wrote:
On 04/22/2015 09:54 AM, Hans Forbrich wrote:Issue here is the definition of BackUp. Unfortunately, I have run across
From the docs: "An RMAN channel represents one stream of data to a
device, and corresponds to one database server session." More in depth at
http://docs.oracle.com/database/121/BRADV/rcmtunin.htm#BRADV170
discusses the processes involved in reading and writing.
I agree with Freek - the channel is on the database machine. It is a
server process and effectively does a form of 'direct path IO' with the
database. At least some portion of the MML must be on the DB server
machine.
That said, it is possible for the channel to communicate across the
network with remote tapes and remote media software - such as Oracle's
Secure Backup, which acts as an MML. This is discussed in the in-depth
section of the docs - although there are large gaps in the details.
Hans, I was commenting on the proposal to have the MML on the 3rd node
and do backups of all database from that node. We seem to have lost track
of the original proposal.
too many people who believe the RMAN executable actually does the work of
backing up the database. My post was to allow access official references
on the process.
As for central 'back up', the referenced doc mentions Oracle Secure
Backup, which is also a centralized mechanism similar in nature to other
commercial products. From that perspective, it is useful to look at
Oracle's implementation of what you describe, and that is available at
http://docs.oracle.com/cd/E16926_01/doc.121/e16564/osb_rman_backup.htm#OBADM187
/Hans
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