新题->2019最新OCP 062考试题库原题-第21题

时间：2019-05-21 来源：

如今OCP认证062考试题库多变，不时的出现一些新考题，让很多考生措手不及，对此，我们专门收集整理了近期062考试的原题，并对这些考题进行了讲解，分享给大家。

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21题、choose three

Which three statements are true about Oracle checkpoint processing?

A) Incremental checkpoints write some dirty buffers to the datafiles and unwritten redo to the online redo logs.

B) Frequent thread checkpoints can degrade database performance.

C) Thread checkpoints ensure that all dirty buffers are written to data files during a normal shutdown.

D) It reduces the recovery time from instance failures.

E) Database Writer (DBWn) processes write checkpoint information to datafile headers and the control file.

Answer：BCD

(解析：答案BCD比较容易理解，答案E让人觉得是对的，DBWR只负责写脏块，更新检查点信息的事情是由检查点进程来做的。)