（多选题）
Why would you run the delete obsolete command？（）
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 backups
正确答案
答案解析
略
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