OCP 062最新考試題庫,062題庫出現大量新題-21
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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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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比較容易理解,答案E讓人覺得是對的,DBWR只負責寫臟塊,更新檢查點信息的事情是由檢查點進程來做的。)