RMAN and Dataguard (10g)

Hi all,
I know this topic has been discussed several times over on this forum, but I have a peculiar situation.
I have just inherited a client system with 10g and DataGuard with RMAN. The standby is Physical and both nodes are on HP-UX version and patchsets.
The standby is persistently idle. The client insists on backing up the physical standby only.
My question is this, is there any danger in backing up on the physical standby?. I've argued the case that we should backup the Primary and Standby to no joy. I am a little worried that we may experience a failure on the primary and start a recovery with backup taken from the Standby node. Is this feasible at all?
Please confirm that I am right.
Regards,
Timothy.

Having a recovery catalog, there's a resync with the standby controlfile after the backup, the backup informations are now in the catalog. Now when you need to restore/recover the primary database you connect to this and to the catalog. Primary and standby are clones , so you access the same record in the catalog regardless whether you are connected to the primary or to the standby. Because of this a resync will refresh the primary controlfile with the backup records which were taken while connected to th standby. A simple backup/recovery example looks like this:
1) connect target sys/pwd@stdby catalog rman/pwd@rmancat
2) backup database; (resync happens automatically after this)
4) connect target sys/pwd@prim catalog rman/pwd@rmancat
5) resync catalog;
6) restore database;
7) recoverer database:
It's not mandatory, but recommended to backup the archivelogs on the primary side. Here you are sure to have all archivelogs (at least under regular circumstances). For many reasons it could happen, you miss some archives on the standby side.
It's possible to run a standby in read-only mode for reporting purposes. In this case archivelog applying is suspended. If you have such a situation it's not recommended to backup the standby database, possibly it does not change for a long time and in case of recovery you have to apply a large number of archivelogs.
Werner

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We are trying to setup RMAN ( Incremental backup ) for a Dataguard system for Oracle 10G. As I am new to this can anyone help me to start the setup for this?

See "Using RMAN to Back Up and Restore Files" in "Data Guard Concepts and Administration 10g Release 2 (10.2) B14239-05"
http://docs.oracle.com/cd/B19306_01/server.102/b14239/rman.htm
More information
Re: Configuring rman for dataguard environment.
Best Regards
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Hello,
We used RMAN for backups and recently implemented a dataguard environment in 10g r2(physical standby). While perusing upgrading to 11g I came across instructions saying you must use a recovery catalog in a dataguard environment. The backups are running on the primary just using the control file and all seems to be working. I did a 'restore database validate' and it succeeded. Is the recovery catalog only necessary if I chose to do the backups on the standby - or is a catalog required in my scenario?
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Mark
Edited by: user6061469 on Apr 20, 2011 11:43 AM

You were able to build your standby without using a catalog.
You are able to take backups of your primary without using a catalog.
Where does it say (in the documentation) that a recovery catalog is required ?
With the enforcement of DB_UNIQUE_NAME you can use the same catalog for Primary and Standby backups -- if you run backups from both locations. That is an enhancement. But not a requirement if you don't need to or plan to backup both sites and use a common catalog.
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I guess I need to get to grid control, but that has been such a painful process. I believe it will be a work around since the control file is the thing in the way.

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Hi all,
Here we have a dataguard environment with db1 as primary and db2 as physical standby database. We configured dataguard in 10g environments and we are not using grid control. Can anyone provide the steps for configuring rman for incremental backups in this environment? We want to schedule the backups to be taken in standby db, (that is applicable in case of swithover too). In the case of swithover to db2 what all do we need to do in rman manually to resume backups in db1?
Thanks

Hello;
A Standby database is a copy of the Primary so if you try to register it RMAN will probably tell you its already registered. I would start with this :
Standby based backup
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3. Set the archive deletion policy. CONFIGURE DELETION POLICY TO NONE.
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See "Using RMAN to Back Up and Restore Files" in "Data Guard Concepts and Administration 10g Release 2 (10.2) B14239-05"
http://docs.oracle.com/cd/B19306_01/server.102/b14239/rman.htm
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How to manage primary and standby database backups using rman catalog
How to use standby backup to restore primary db
http://alexzeng.wordpress.com/2008/09/13/how-to-use-standby-backup-to-restore-primary-db/
Best Regards
mseberg

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great!
thanks a lot!
this is definitely valuable info and I'll read right away. but as far as understand they suggest to use Data Guard, Standby and RAC which are the best ways to prevent your environment from crash. But in reality (I mean in my company) nobody is going to move to RAC at this point and I'm not sure, that they will have a chance to do in the next year. they just aren't up to it.
what I'm looking for is probably some tips and hints about backups in more or less big environment, but not as big as Oracle itself :-) unfortunately, i'm the only DBA in my surrounding. i mean, i have no friends or mentors DBAs that could seat with me in a pub and pass theirs knowledge from generation to generation :-)))
but anyway, I'll devote this week-end to this link.
thanks a lot!

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