OCP 1Z0 052 86

86. View the Exhibit to examine the output for the CROSSCHECK BACKUP command.  

Which statement is true about the output of the command?  
A.The backup piece is expired as the new backup is available. 
B.The backup piece is expired because the operating-system file was not found. 
C.The backup piece is expired because the retention period for the backup has expired. 
D.The backup piece is expired because the backup set to which it belongs is not complete. 
Answer: B 
expired backup 是指因文件被删除或移走而找不到的备份

expired backup

A backup whose status in the RMAN repository is EXPIRED,which means that the backup was not found. RMAN marks backups and copies as expired when you run a CROSSCHECK command and the files are absent or inaccessible.

obsolete backup

A backup that is not needed to satisfy the current backup retention policy. For example, if your retention policy dictates that you must maintain one backup of each data file, but you have two backups of data file 1, then the second backup of data file 1 is considered obsolete.