单项选择题
单项选择题 Verysoonyouwillbeperformingmaintenanceoperations.Youwouldhaveseveraljobstorunassoonasthemaintenanceperiodstarts.Whichmethodwouldyouusetocreatejobswithoutspecifyingthetimeperiodwhenthejobshouldberun？（）
单项选择题 Youspecifiedextentmanagementaslocalforatablespace.Howwillitaffectspacemanagementinthetablespace？（）
单项选择题 YouexecutedtheSTARTUPMOUNTcommandtostartyourdatabase.ForwhichdatabaseoperationdoyouneedtostartthedatabaseintheMOUNTstate？（）