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?（）

单项选择题WhichofthefollowingoperationsdoesnotrequireOracletostoreinformationinanUNDOsegmentsaspartofthetransaction?（）

A.INSERT 
B.SELECT 
C.UPDATE 
D.DELETE

单项选择题Toallocateanotherroletoauser,whichcommandismostappropriate?（）

A.ALTER USER 
B.ALTER DATABASE 
C.ALTER SYSTEM 
D.GRANT

单项选择题Youareattemptingtoclearanunarchivedredologfile.Inordertomanuallyenactalogswitch,whichofthefollowingstatementsisappropriate?（）

A.ALTER DATABASE 
B.ALTER SYSTEM 
C.ALTER USER 
D.ALTER REDO LOG

单项选择题YouareanalyzingthecomponentsoftheredologmechanismsinyourOracledatabase.WhichofthefollowingpurposesdoestheCKPTprocessserve?（）

A.Writes buffers to disk 
B.Writes current redo log number to datafile headers 
C.Writes redo log information to disk 
D.Reads information into memory for users

单项选择题TheDBAisdefiningroleforusers.Whichofthefollowingisnotanacceptablemethodfordefiningadefaultrole?（）

A.ALTER USER DEFAULT ROLE ALL
B.ALTER USER DEFAULT ROLE ALL EXCEPT ROLE_1
C.ALTER USER DEFAULT ROLE NONE
D.ALTER USER DEFAULT ROLE NONE EXCEPT ROLE_1