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After running the CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS command， what has been accomplished？（）
A:Retain the data file backup for 7 days.
B:Run the recover process every 7 days.
C:Destroy the physical backup files every 7 days.
D:Destroy the physical backup files older than 7 days.
E:Retain one backup of each data file for at least 7 days.
F:Keep the catalog information in the control file for 7 days.

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出自：Oracle认证

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