Re: Cron management...

From: Ram Raman <veeeraman_at_gmail.com>
Date: Wed, 22 Apr 2015 14:44:13 -0500
Message-ID: <CAHSa0M0C8QFW0H-0s_aTyJE69+OEJL136y0SrTMwEsxF8toTjg_at_mail.gmail.com>

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_at_gmail.com> wrote:

> On 22/04/2015 8:41 AM, Mladen Gogala (Redacted sender mgogala_at_yahoo.com
> for DMARC) wrote:
>
>> On 04/22/2015 09:54 AM, Hans Forbrich wrote:
>>
>>>
>>> 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.
>>
>>
> Issue here is the definition of BackUp. Unfortunately, I have run across
> 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
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>

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Received on Wed Apr 22 2015 - 21:44:13 CEST