RMan is Oracles de-facto backup and recovery application. It is used to backup the database files and archive logs. Sometimes an archive log might be mistakenly removed, moved or renamed from disk without following RMan’s backup retention policy. Since it is in the rman catalog it will try to make a backup of the missing archive log. This will cause rman to fail when it tries to make a backup of the archive log with the following error message:
RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03002: failure of backup command at <date> RMAN-06059: expected archived log not found, lost of archived log compromises recoverability ORA-19625: error identifying file <archive_log> ORA-27037: unable to obtain file status

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