Your database instance has started using an SPFILE. Examine the RMAN configuration settings: You execute the command: RMAN> BACKUP AS COPY TABLESPACETEST; Which three types of files are backed up by u

Online redo log files are never backed up by RMAN because they are continuously being written to and are only truncated after being archived.

RMAN automatically backs up the control file when performing a backup of data files or tablespaces, ensuring that the necessary metadata for recovery is available.

When the database is using an SPFILE, RMAN automatically backs up the SPFILE along with the control file and data files, as it is crucial for instance startup.

Archived redo log files are not included in a BACKUP TABLESPACE command unless specifically requested with clauses like PLUS ARCHIVELOG or a separate BACKUP ARCHIVELOG command.

The BACKUP AS COPY TABLESPACE TEST command explicitly instructs RMAN to create image copies of all data files belonging to the TEST tablespace.

A PFILE is a static text file and is not used when an SPFILE is active; RMAN backs up the SPFILE, not an unused PFILE.