Oracle introduced the SKIP READONLY option

Until 11gr1 by default, the restore command skipped datafiles associated with read-only tablespaces. If you needed read-only tablespaces restored, then you had to use the “check readonly” command or restore each read-only tablespace individually.
Have a look at the restore syntax on “Oracle Database Backup and Recovery Reference 10g Release 2 (10.2)” Part Number B14194-03  and compare it with the syntax used on “Oracle Database Backup and Recovery Reference 11g Release 1 (11.1) Part Number B28273-03” .

In the latter syntax Oracle introduced the SKIP READONLY option, inverting the previous logic: the SKIP READONLY does not restore read-only files.

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