What is the purpose of the list expired backup command?
A. Lists all backups impacted by a resetlogs command
B. Lists all backups that are subject to retention criteria
C. Lists all backups that are missing associated physical backup set pieces
D. Lists the status of datafile backup failures due to the use of the duration command
E. Lists backups that cannot be used by the restore command because they have been marked as
disabled
An expired backup is one that is missing one or more physical backup set pieces.The
list expired backup command lists these types of backups.
原文：http://www.cnblogs.com/Babylon/p/7794339.html