How to remove older backups for non-existent db_id

I'll put up of backups rman for our databases of test & dev. These are cloned manually using commands in the o/s. As all of these databases are clones of prod, they have the same db_id. So I've discovered that I need to use the utility 'nest' change the db_id to save in the rman catalog. However, if I create a new clone of prod and give it a new db_id, older backups for the previous db_id (i.e. the previous clone that this replaced) are still in the recovery catalog.

I see this info in the recovery catalog views, i.e.

-----
Select * from rc_database
DB_KEY DBID NAME RESETLOGS_CHANGE DBINC_KEY # RESETLOGS_TIME
1 701 3620254146 HOUTEST 3309633197328 21/04/2009 13:14:05
341 342 3688071086 RMANTEST 1 2008-12-22 11:40:30
919 920 3699186203 RMANTEST 3209104 27/04/2009 15:19:52
-----
In this example, db_id 3688071086 no longer exists and I'm unable to realize by using rman commands.

So the problem is, how can we remove these old outdated backups? I tried the recovery window setting to a low value and running "remove obsolete", but the extent of the rman is concerned, it will not erase records for the old db_id and that no longer exists.

For now we are just rman configuration on our test systems, this is why it is not yet in production.
Of course, Miss me something fundamental here, maybe someone could point me in the right direction?

The platform is Sun Solaris 10 with Oracle 10.2.0.3

Thank you

See scenario,

1. you have A DBID 1111 data say.
2. register cela in the catalog and took the backup.
3. now you have changed the DBID of 1111 to 2222 for A database.
4. now you must save new data in the recovery catalog as in the recovery catalog database are identified by the DBID. So now, recovery catalog will take this A database as a new database.
5. now, when do you the backup list, it will not display the backup for old DBID. Even if you try to connect to the database as old DBID, it will not be possible as long as changing the DBID of a database means logically that old database has been deleted. It's what will examine RMAN. But the information for the old database DBID will remain in the recovery catalog schema. Giving orders of overlap or remove obsolete commands does not remove this backup from old DB of the disk or tape as the old database is not recognized by the RMAN now.
So, you need to delete information on the old database to the catalog of recovery manually from the catalog schema then remove physical backups manually from tape or disk.

Kind regards
Navneet

Tags: Database

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