单项选择题

YouhaveimplementedOMFforredologmanagement.Whichofthefol……

You have implemented OMF for redo log management. Which of the following choices reflects a log filename that might be employed when OMF is enabled?（）

A.log01.log
B.logORCL01.log
C.1_2.logALTER ROLLBACK SEGMENT
D.ora_1_asdf1234.log

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单项选择题WhichofthefollowingoperationsdoesnotrequireOracletostoreinformationinanUNDOsegmentsaspartofthetransaction?（）

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A.ALTER USER
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A.ALTER DATABASE
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单项选择题TheDBAisdefiningroleforusers.Whichofthefollowingisnotanacceptablemethodfordefiningadefaultrole?（）

A.ALTER USER DEFAULT ROLE ALL
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