单项选择题
View the Exhibits.
You performed operations on the DEPT4 table as shown in the Exhibit. When you perform the FlashbackVersions Query， you find that the first two updates are not listed. What could be the reason？（）
A.The row movement is not enabled on the table.
B.The first two updates were not explicitly committed.
C.The Flashback Versions Query lists only the most recent update.
D.The Flashback Versions Query stops producing rows after it encounters a time in the past when the table structure was changed.
相关考题
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单项选择题
You are working in an online transaction processing （OLTP） environment. You realize that the salary for an employee， John， has been accidentally modified in the EMPLOYEES table. Two days ago， the data was in the correct state. Flashback logs generated during last two days are available in the flash recovery area. Which option would you choose to bring the data to the correct state while ensuring that no other data in the same table is affected？（）
A.perform point-in-time recovery
B.perform a Flashback Table operation to restore the table to the state it was in two days ago
C.perform a Flashback Database operation to restore the database to the state it was in two days ago
D.perform Flashback Versions Query and Flashback Transaction Query to determine all the necessary undo SQL statements， and then use them for recovery -
多项选择题
ForwhichtwoSQLstatementscanyouusetheFlashbackTablefeaturetorevertatabletoitspreviousstate？（）
A.UPDATE TABLE
B.CREATE CLUSTER
C.TRUNCATE TABLE
D.ALTER TABLE MOVE
E.INSERT INTO···VALUES
F.ALTER TABLE···DROP COLUMN
G.ALTER TABLE···DROP PARTITION -
单项选择题
Why would you use the following FLASHBACK TABLE command？（） FLASHBACK TABLE emp TO TIMESTAMP （’11：45’，’hh12：mi’）；
A.to undo the changes made to the EMP table since the specified time
B.to restore the EMP table that was wrongly dropped from the database
C.to view the transactions that have modified the EMP table since the specified time
D.to view the changes made to the EMP table for one or more rows since the specified time
E.to recover the EMP table to a point in time in the past by restoring the most recent backup
