Crosscheck archivelog all

The RMAN commands "crosscheck archivelog all" and "change archivelog all crosscheck" will check the archivelogs whether they are physically available on disk. If the archivelogs are no longer on disk, then the status in the RMAN catalog and controlfile will be marked from"A" for available to "X" for expired.

The RMAN command "delete noprompt expired archivelog all" will only delete entries on expired archivelogs from the RMAN catalog and controlfile (not from the disk bacause "X" means the archivelog has been removed from OS).

To see the list of expired archivelogs, run "delete expired archivelog all" and then answer "no" on confirmation.

Two ways to get archivelog space back from disk:
1. If the archivelogs have never been backed up to tape, back them up and delete them in one command:
RMAN> backup archivelog until logseq delete all input;

2. If you know the archivelogs have a good backup on the tape, you can remove them at OS level (Note 249452.1):
a) delete unwanted archive log files from disk ( rm /del )
b) connect to rman
c) RMAN> crosscheck archivelog all;
d) RMAN> delete expired archivelog all;

Note that "crosscheck backup of archivelog all" means crosschecking backups of archivelog files on the tape, and "delete expired backup of archivelog all" deletes the backup pieces from the MMD database. (??)