单项选择题
A. V$BACKUP_CORRUPTION
B. V$COPY_CORRUPTION
C. V$DATABASE_BLOCK_CORRUPTION
D. RC_BACKUP_CORRUPTION
单项选择题 YouaremaintainingyourOLTPdatabaseinOracle10g.YouareperformingtheFlashbackTransactionQuerytofindtheundoSQLstatementsthatcanbeusedtoundothechangesmadetothedatabaseinthespecifictimeperiod.WhichpseudocolumnwillyouusetoperformtheFlashbackTransactionQuery？（）
单项选择题 WhatwillbetheresultofusingtheSQL>DROPUSERSCOTTCASCADE；command？（）
单项选择题 You are performing flashback of the ORDERS table in the Scott’s schema because some important data is deleted in the table by mistake. The SCN number was 771513 at the time of deletion. You issued the following statement to perform Flashback Table： SQL> FLASHBACK TABLE ORDERS TO SCN 771513； What is the prerequisite to perform Flashback Table？（）