单项选择题
A. FREQ = MONTHLY； BYDAY = 2FRI；
B. FREQ = MONTHLY； BYDAY = FRI（2）；
C. FREQ = MONTHLY； BYDAY = FRI2；
D. FREQ = MONTHLY； BYDAY = -2FRI；
多项选择题 You enabled Automatic Shared Memory Management. The initialization parameters are set as shown below： SGA_TARGET = 10GB SGA_MAX_SIZE = 14GB STREAMS_POOL_SIZE = 1GB SHARED_POOL_SIZE = 3GB Which two statements are correct in this scenario？ （）
单项选择题 Verysoonyouwillbeperformingmaintenanceoperations.Youwouldhaveseveraljobstorunassoonasthemaintenanceperiodstarts.Whichmethodwouldyouusetocreatejobswithoutspecifyingthetimeperiodwhenthejobshouldberun？（）
单项选择题 Amediafailurehasoccurred.Thishasresultedinallthemembersofthenextloggroupbeingrenderedinaccessibletothelogwriterprocess（LGWR）atalogswitch.Howdoesthisfailureaffecttheoperationaldatabase？（）