392.To clean up old records that are in a Flashback Data Archive and are past the retention period, what
must the DBA do?
A. TRUNCATE the archive table.
B. DROP the Flashback Data Archive.
C. Nothing; expired rows are automatically removed.
D. Nothing; expired rows are moved to an archive table.
E. Delete entries from the archive where the metadata date retained is greater than the retention period.
Answer: C
答案解析：
参考：闪回数据归档：http://blog.csdn.net/rlhua/article/details/12221269
通常会在保留时间到期后的第一天执行自动清除。