Check PDB dropped from CDB and List backups of dropped PDBs RMAN
1. Connect to the root as a common user with the SYSDBA or SYSBACKUP privilege.
SQLPLUS / as sysdba
2. Determine the dropped PDB from CDB with DBA_PDB_HISTORY view and get GUID for List command.
example displays the PDBs that were dropped from the CDB test_db:
SELECT pdb_name, pdb_guid FROM dba_pdb_history WHERE db_name = 'test_db';
3. Use the LIST command with the GUID option to display backups of a dropped PDB.
LIST BACKUP GUID 'CDFFD672330A7527D0147204CD0E08D4';
LIST COPY GUID 'CDFFD672330A7527D0147204CD0E08D4';