单项选择题
To allocate another role to a user, which command is most appropriate?（）
A.ALTER USER
B.ALTER DATABASE
C.ALTER SYSTEM
D.GRANT
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A.ALTER DATABASE
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YouareanalyzingthecomponentsoftheredologmechanismsinyourOracledatabase.WhichofthefollowingpurposesdoestheCKPTprocessserve?（）
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TheDBAisdefiningroleforusers.Whichofthefollowingisnotanacceptablemethodfordefiningadefaultrole?（）
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