三七入药部位是（）。

A. 有关空中交通服务程序
B. 减低噪音程序
C. 机场等待和进近程序、进场和离场程序
D. 上述三项

A. To remove missing backup set pieces physically from disk
B. To remove metadata related to backup set pieces in the control file and the recovery catalog
C. To mark as deleted records in the control file and the recovery catalog associated with obsolete backup sets
D. To delete backup set pieces associated with backups that are no longer needed due to retention criteria
E. To remove old versions of RMAN backu