【2019】OCP考試062題庫近期考試原題解析-第45題
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我要咨詢2018年的時候，OCP 11g考試題庫大更新，052 053出現了很多新題，
2019年，11g即將停考的前期，Oracle又出現了一次大變動，12c出現了很多新題，比如062 063題庫大更新
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45題、choose three
Which three statements are true about the purpose of checkpoints?
A) They ensure that instance recovery starts in the event of an instance failure.
B) They ensure that dirty buffers in the buffer cache are written to disk regularly.
C) They reduce the time required for recovery in case of an instance failure.
D) They ensure that all the dirty buffers are written to disk during a normal shutdown.
E) They ensure that uncommitted transactions are rolled back in case of an instance failure.
Answer：BCD
(解析：checkpoint進程就是給dbwr寫的信號，定期的保持，減少實例恢復時間，正常關閉時把所有的臟塊寫入數據文件。)
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