does not delete backups required to satisfy the specified retention policy, even if some backups have
times set which have passed to override the retention policy.
UNTIL clause never causes RMAN to consider a backup obsolete, if the backup is still required to satisfy the retention policy.
can cause backups to be kept longer than the retention policy requires,
but never causes a backup to become obsolete sooner than the retention
Backups are never obsolete if they are still needed to meet the retention policy, regardless of any
UNTIL time. With a recovery window-based retention policy, even if the specified
time has expired, the backup is retained if the backup is needed to
satisfy the recovery window. With a redundancy-based retention policy,
even if the specified
UNTIL time has expired, the backup is retained as long as it is required to satisfy the redundancy requirement.