（单选题）
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？（）
AYou performed rollback after commit.
BIf a log switch occurs in your database.
CThearchiverfails to generate an archived log file.
DInstance recovery fails to find one of the redo log files.
EA long-running query is unable to get read-consistent image.
FIf you perform manual undo management operations in auto mode.
正确答案
答案解析
略
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