E is correct
tested: backup pluggable database "cdb$root". the quotes due to the $ symbol. it backups only the root container files (no pdb datafiles).
tested CD: both incorrect
Tested b: correct
A is not correct due to the "must". you can connect to cdb and distinguish between tbs with same name in different pdbs with qualifying
RMAN> BACKUP TABLESPACE pdb1:system, pdb1:sysaux, pdb1:users, pdb2:system;
BE
A - This statement is incorrect. RMAN can back up tablespaces from multiple PDBs in a single operation when connected to the root container. It distinguishes tablespaces with the same name that belong to different PDBs.
I think B and D
rman target='sys@pdb2'
backup database plus archivelog;
No any issues.
E is wrong
rman target=/
BACKUP PLUGGABLE DATABASE
error message
B is CORRECT, no doubts here as I see.
D is NOT correct:
Starting backup at 20-MAY-21
skipping archived logs when connected to a PDB
backup cancelled because there are no files to backup
Finished backup at 20-MAY-21
E is CORRECT:
RMAN> RUN
{
allocate channel ch1 type disk;
BACKUP as COMPRESSED BACKUPSET INCREMENTAL LEVEL 0
pluggable database "CDB$ROOT"
FORMAT '/u01/oracle/BACKUPS/%d_%T_%U.DB';
}
2> 3> 4> 5> 6> 7>
allocated channel: ch1
channel ch1: SID=36 device type=DISK
Starting backup at 20-MAY-21
...
piece handle=/u01/oracle/BACKUPS/CDB01_20210520_04vvbhh2_1_1.DB tag=TAG20210520T192730 comment=NONE
channel ch1: backup set complete, elapsed time: 00:00:25
Finished backup at 20-MAY-21
A is wrong because you can connect to a CDB to perform the tablespace backup
https://oracle-base.com/articles/12c/multitenant-rman-backup-recovery-cdb-and-pdb-12cr1#tablespace-and-datafile-backups
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