单项选择题
A.INSERT
B.SELECT
C.UPDATE
D.DELETE
单项选择题 Toallocateanotherroletoauser,whichcommandismostappropriate?（）
单项选择题 Youareattemptingtoclearanunarchivedredologfile.Inordertomanuallyenactalogswitch,whichofthefollowingstatementsisappropriate?（）
单项选择题 YouareanalyzingthecomponentsoftheredologmechanismsinyourOracledatabase.WhichofthefollowingpurposesdoestheCKPTprocessserve?（）