One database with multiple instance names

Dear all,
We would be very happy if anyone can provide me with some information of how RMAN operates.
Current situation: we have 2 machines running Oracle9i with just one database. The production database is "replicated" using EMC's TimeFinder/Snap. The differences are:
1. production database directory structure is slightly different than the replicated one: /usr/oraprod and /usr/orasnap respectively.
2. their pfiles are different: besides the differences in files location (controlfile, dumps,...), the instance_name are different (oraprod and orasnap respectively), but their db_name must be equal, which is oraprod.
3. at startup of the orasnap instance, all datafiles and redolog files must be adjusted/renamed to the orasnap directory structure (using a number of: alter database rename file) and the temporary tablespace needs to be recreated.
The orasnap instance is now ready for use... but problems arises within the RMAN repository. The oracat DB is the rman catalog. Connection to rman is done in this way:
$ORACLE_HOME/bin/rman target "sys/<password>@oraprod" CATALOG "catuser/<password>@oracat"
But "report schema;", whether the target is oraprod or orasnap, lists files which has the orasnap directory structure.
If the target is oraprod, then I expect to see the directory structure of oraprod and NOT the that of orasnap.
Did I overlooked something in here?
All help would be appreciated...
ps: see also my previous thread: "RMAN stops registering backups"

Hi Ebrian,
Another funny thing of RMAN's incarnations: rman seems not to be able to give a detailed backup listing (or restore some files) of the incarnation datafiles like:
RMAN> list backup;
BS Key Type LV Size Device Type Elapsed Time Completion Time
9266 Full 55G SBT_TAPE 00:41:37 19-NOV-07
BP Key: 9267 Status: AVAILABLE Tag: TAG20071119T021235
Piece Name: db_ORAPROD11771177639022355639022355
Controlfile Included: Ckp SCN: 4023549447 Ckp time: 19-NOV-07
List of Datafiles in backup set 9266
File LV Type Ckp SCN Ckp Time Name
1 Full 4023549460 19-NOV-07 /usr/oradata/oraprod/oradata2/system01.dbf
44 Full 4023549460 19-NOV-07 /usr/oradata/oraprod/oradata2/JAFFA_TSB_2.dbf
49 Full 4023549460 19-NOV-07 /usr/oradata/oraprod/oradata2/JAFFA_TSB_1.dbf
50 Full 4023549460 19-NOV-07 /usr/oradata/oraprod/oradata2/JAFFA_TSB.dbf
51 Full 4023549460 19-NOV-07 /usr/oradata/oraprod/oradata2/BLOB_TSP.dbf
Instead, we have only:
RMAN> list incarnation;
List of Database Incarnations
DB Key Inc Key DB Name DB ID CUR Reset SCN Reset Time
8357 8408 ORASNAP 2706083210 NO 1 06-MAR-06
8357 8358 ORASNAP 2706083210 YES 4014480736 15-NOV-07
8569 8620 ORASNAP 2706169607 NO 1 06-MAR-06
8569 8570 ORASNAP 2706169607 YES 4016907657 16-NOV-07
8990 9041 ORASNAP 2706322688 NO 1 06-MAR-06
8990 8991 ORASNAP 2706322688 YES 4020564274 17-NOV-07
3336 3337 ORAPROD 4063199190 YES 1 06-MAR-06
To know what is in (8990, 8991), we need to request:
SQL> select dbinc_key, fname from dfatt where dbinc_key = 8991
So, how can we treat incarnations? List, restore, ...

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