In general, the rules of RMAN compatibility are as follows:
You can create 8.X or 9.X RMAN catalog schema in any Oracle database release
8.1.X (or higher) and Release 10g RMAN catalog schema in any Oracle database
release 9.0.1 (or higher).
The recovery catalog schema version must be greater than or equal to the
RMAN client version.
Ideally, the versions of the RMAN client and the target database should be the same (although there are other legal combinations, listed in Table B–1).
While backing up a Release 10g database using the 9.X RMAN client, you cannot include a controlfile that was created using compatible=10.0.0 in a datafile backupset. The workaround is to turn controlfile autobackup ON. under table shows version requirements for RMAN components. Note the following
conventions when interpreting this table:
">=8.1.7" means 8.1.7, 9.0.1, 9.2.0 and 10.1.0 and their patches
">=8.0.6" means 8.0.6, 8.1.7, 9.0.1, 9.2.0 and 10.1.0 and their patches
When using an older version of the RMAN client with a newer version of the
database, you do not get the features of the newer version. For example, when using the Oracle9i RMAN client to back up an Oracle Release 10g database, you will not have access to features like the flash recovery area, flashback database, TSPITR with an RMAN-managed auxiliary instance, or recovery through resetlogs
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