单项选择题
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.
单项选择题 You want to configure and schedule offline database backups to run automatically. Which tool or utilitywould you use to achieve this（）
多项选择题 WhichtwofilesinthedatabasecanbeconfiguredforautomaticbackupsbyusingtheautobackupfeatureinRecoveryManager（RMAN）（）
单项选择题 You are using Enterprise Manager to schedule backups for your database. Which type of script wouldbe generated by the backup scheduler（）
