单项选择题

You are attempting to clear an unarchived redo log file. In order to manually enact a log switch, which of the following statements is appropriate?（）

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

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热门试题

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