单项选择题
A.flash back the corrupted blocks
B.use the DBMS_REPAIR package
C.use the RMAN TSPITR command
D.use the RMAN BLOCKRECOVER command
E.use the RESTORE DATABASE and RECOVER DATABASE commands
F.investigate the time at which the corruption occurred and perform a pointintime recovery
单项选择题 Byusingthetransactionidentifierprovidedby（）foraparticularrowchange，youcanusetheFlashbackTransactionQuerytoseetheoperationperformedbythetransaction.
单项选择题 You executed the following query： SELECT operation， undo_sql， table_name FROM flashback_transaction_query Which statement is correct regarding the query output？（）
单项选择题 By mistake， you ran the batch job （for updating the BILL_DETAILS table） twice. You are not sure which rows in the BILL_DETAILS table were affected. You need to identify： a） a list of changes made along with the transaction identifier of each change b） the necessary SQL statements to undo the erroneous changes Which option would you choose？（）