单项选择题
A.Cancel-based
B.Recovery using a backup control file
C.Time-based
D.Change-based
单项选择题 WhichOraclebackgroundprocessisresponsibleforprovidinginformationabouttheinstancenameassociatedwiththeservicehandlersandservicestothelistener？（）
单项选择题 Whichofthefollowingoptionsenablesausertogetauthenticatedthoughasinglepasswordinsteadofusingmultiplepasswords？（）
单项选择题 Whichofthefollowingrolesmustbegrantedtoausertoperformafulldatabaseimport？（）