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You work as a database administrator for Certkiller .com. You received the following error while working on your database： ORA-01555： snapshot too old  In which situation would you receive such an error？（）
A:You performed rollback after commit.
B:If a log switch occurs in your database.
C:Thearchiverfails to generate an archived log file.
D:Instance recovery fails to find one of the redo log files.
E:A long-running query is unable to get read-consistent image.
F:If you perform manual undo management operations in auto mode.

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出自：Oracle认证

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