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You are in the middle of a transaction updating a very important table. The machine on which a database wasrunning reboots because of power outage. This caused a database instance failure. Which statement is true inthis situation（）
A:The online redo log files and archived redo log files are required to accomplish the recovery.
B:The uncommitted transaction will be committed at the next startup of the database instance.
C:The uncommitted transaction is rolled back automatically at the next opening of the database.
D:The DBA has to perform the recovery on the database to recover the uncommitted transaction

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出自：Oracle认证

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