单选题Before a Flashback Table operation, you execute the following command: ALTER TABLE employees ENABLE ROW MOVEMENT; Why would you need this to be executed?（）ABecause row IDs may change during the flashback operationBBecause the object number changes after the flashback operationCBecause the rows are retrieved from the recycle bin during the flashback operationDBecause the table is moved forward and back to a temporary during the flashback operation
单选题
Before a Flashback Table operation, you execute the following command: ALTER TABLE employees ENABLE ROW MOVEMENT; Why would you need this to be executed?（）
A
Because row IDs may change during the flashback operation
B
Because the object number changes after the flashback operation
C
Because the rows are retrieved from the recycle bin during the flashback operation
D
Because the table is moved forward and back to a temporary during the flashback operation
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单选题A developer calls and reports that he accidentally dropped an important lookup table from a production database. He needs the table to be recovered. What action would you take？（）A Initiate an incomplete recovery operation using RMAN.B Copy the table from a development database.C Advise the user to rekey the data.D Perform a Flashback Drop operation.E Perform a Flashback Recovery operation.
多选题You are performing flashback of the EMPLOYEE table in SCOTT’s schema because some incorrect data was inserted into the table and committed by mistake. Which two clauses will you use in the FLASHBACK TABLE statement for using the Flashback Table feature？ （）ARESETLOGSBTO TIMESTAMPCTO BEFORE DROPDRENAME TOETO SCN
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单选题Before a Flashback Table operation，you execute the following command： ALTER TABLE employees ENABLE ROW MOVEMENT； Why would you need this to be executed？（）A Because row IDs may change during the flashback operationB Because the object number changes after the flashback operationC Because the rows are retrieved from the recycle bin during the flashback operationD Because the table is moved forward and back to a temporary during the flashback opertion