when you want to restore an important table that is dropped from the Recycle Bin
when you want to obtain the SQL statements to undo the deletion of some important records from a table by a transaction
when you want to restore a dropped user’s schema
when a row of a table is updated many times within a specific time period and you want all the versions of the row in the specified time period
第1题：
You are working in an online transaction processing （OLTP） environment. You used the FLASHBACK TABLE command to flash back the CUSTOMERS table. Before executing the FLASHBACK TABLE command， the System Change Number （SCN） was 663571. After flashing back the CUSTOMERS table，you realize that the table is not in the correct state and the resultant changes are not what you had desired. So， you need to reverse the effects of the FLASHBACK TABLE command while ensuring that： a） No other user data in the database is affected. b） The operation takes the minimum possible time. Which option would you choose？（）
第2题：
By using the transaction identifier provided by（）for a particular row change， you can use the Flashback Transaction Query to see the operation performed by the transaction.
第3题：
A. point-in-time recovery
B. execute the ROLLBACK command with transaction number
C. flashback the database to before the transaction was committed
D. determine all the necessary undo SQL statements from FLASHBACK_TRANSACTION_QUERY and use them for recovery
第4题：
Which method would you use to undo the changes made by a particular transaction without affecting the changes made by other transactions?（）
第5题：
You are maintaining your OLTP database in Oracle10g. You are performing the Flashback Transaction Query to find the undo SQL statements that can be used to undo the changes made to the database in the specific time period. Which pseudocolumn will you use to perform the Flashback Transaction Query？（）
第6题：
You want to use the Flashback Transaction Query feature to identify all the changes made to your database within a specific time period. What is a prerequisite for using the Flashback Transaction Query feature？（）
第7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？（）
第8题：
You are employed as a DBA in an organization. You are informed that the record of EMP_NO 1000 is missing from the SCOTT.EMP table. You are required to identify the user who deleted the record， the SQL statement that will undo the deletion， and the transaction ID of the transaction that deleted the employee record. Which feature will you use to perform the tasks？（）
第9题：
In which scenario will you use the Flashback Transaction Query feature？（）
第10题：
You query the ORDERS table and discover that order number 1101 is missing. One of your reports， generated at 5：00 A.M. on April 23， 2005 using Oracle Reports， includes this order number in the output. You have inserted 100 new orders into the ORDERS table since generating this report. Which flashback technology would you use to recover order number 1101 into the ORDERS table without losing the 100 orders that you added after the report was generated？（）