单选题What does it mean if a backup is expired?（）A The backup set has exceeded the retention criteria set in RMAN and is eligible for removal. B The backup set has one or more invalid blocks in it and is not usable for recovery. C The backup set contains one
题目
单选题
What does it mean if a backup is expired?（）
A
The backup set has exceeded the retention criteria set in RMAN and is eligible for removal.
B
The backup set has one or more invalid blocks in it and is not usable for recovery.
C
The backup set contains one or more tablespaces no longer in the database.
D
The backup set contains one or more missing backup set pieces.
E
The backup set is from a previous version of RMAN and was not upgraded.