单项选择题
A.When the instance is started
B.When the database is mounted
C.When the database is opened
D.When the database is closed
单项选择题 AuserissuesaSELECTcommandagainsttheOracledatabase.WhichofthefollowingchoicesdescribesastepthatOraclewillexecuteinsupportofthisstatement?（）
单项选择题 Youhavealong-runningprocessyouwanttoassigntoaspecificUNDOsegmentbroughtonlineforthatexpresspurpose.YouarenotusingautomaticUNDOmanagement.Whatstatementcanbeusedforthistask?（）
单项选择题 Whichofthefollowingchoicescorrectlydescribesthedifferencebetweenadataloadviatheconventionalpathandthedirectpath?（）