（单选题）
One of the user sessions was terminated abnormally in the middle of a transaction. What does Oracle database do to recover it？（）
Auses undo data for roll forward
Buses Flashback Log for recovery
Cuses online redo logs to roll back
Duses undo data to roll back the transaction
Euses Recovery Manager （RMAN） to roll back
Fuses the System Monitor （SMON） background process to perform instance recovery
正确答案
答案解析
略
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