Home » RDBMS Server » Backup & Recovery » RMAN BACKUP from SNAPSHOT
RMAN BACKUP from SNAPSHOT [message #457856] Wed, 26 May 2010 03:52 Go to next message
saptek
Messages: 4
Registered: May 2010
Junior Member
Hello,

Is it possible to backup a pointer-based snapshot with RMAN ?

How does RMAN works with this kind of snapshot ?

Any doc appreciated..

Thanks
SAPTEK.
Re: RMAN BACKUP from SNAPSHOT [message #457859 is a reply to message #457856] Wed, 26 May 2010 04:00 Go to previous messageGo to next message
Michel Cadot
Messages: 57613
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator
if "pointer-based" means "point in time", no it is not possible, RMAN backs up what is current and not what was in the past.

Regards
Michel
Re: RMAN BACKUP from SNAPSHOT [message #457864 is a reply to message #457859] Wed, 26 May 2010 04:10 Go to previous messageGo to next message
saptek
Messages: 4
Registered: May 2010
Junior Member
Thanks for reply....

I don't understand what "in the past means" ...

A point-in time snapshot is just a frozen picture of the DB....

if you shutdown your DB now and backup it with RMAN next week, it is also in the past....

what's the problem ???

Regards
Re: RMAN BACKUP from SNAPSHOT [message #457865 is a reply to message #457864] Wed, 26 May 2010 04:14 Go to previous messageGo to next message
Michel Cadot
Messages: 57613
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator
So what do you mean with your "point-in-time" backup?
If you want to mean backup at a precise scn for all data, RMAN does not do this, it backups the data as there are when it reads them.

Regards
Michel
Re: RMAN BACKUP from SNAPSHOT [message #457869 is a reply to message #457865] Wed, 26 May 2010 04:22 Go to previous messageGo to next message
saptek
Messages: 4
Registered: May 2010
Junior Member
a pointer based snapshot is a set of pointers addressing reals blocks of the DB if not modified and a copy of the modified blocks before modification for those modified since snapshot...

it's a kind of dynamic clone...

understand what i mean ?

Michel si tu es fran├žais on pourrais peut etre changer de langue Razz

Thanks
Re: RMAN BACKUP from SNAPSHOT [message #457877 is a reply to message #457869] Wed, 26 May 2010 04:44 Go to previous messageGo to next message
Michel Cadot
Messages: 57613
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator
Ok I understand what you mean.
As far as I know RMAN does not natively offer this feature, maybe through a MML.

Regards
Michel
Re: RMAN BACKUP from SNAPSHOT [message #457878 is a reply to message #457877] Wed, 26 May 2010 04:45 Go to previous messageGo to next message
saptek
Messages: 4
Registered: May 2010
Junior Member
Thanks for your reply...

SAPTEK.
Re: RMAN BACKUP from SNAPSHOT [message #457884 is a reply to message #457878] Wed, 26 May 2010 04:52 Go to previous message
Michel Cadot
Messages: 57613
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator
I keep this topic in english as other more skilled people like Mahesh Rajendran can answer (if we move to french then the topic should have to be moved to French forum).

Regards
Michel
Previous Topic: rman tablespace restore
Next Topic: Archive log files
Goto Forum:
  


Current Time: Sun Apr 20 12:28:06 CDT 2014

Total time taken to generate the page: 0.08725 seconds