In order to perform Flashback Transaction Query operations， which of these steps are required？（）

单项选择题AUM has been retaining about 15 minutes worth of undo. You want to double the retentionperiod， but not at the expense of new transactions failing. You decide to alter the system to set the parameter UNDO_RETENTION=18000. However， AUM still retains only about 15 minutes worth of undo.  What is the problem？ （）

A. You need to alter the undo tablespace to add the RETENTION GUARANTEE setting.
B. You need to increase the size of the undo tablespace.
C. The undo tablespace is not set to auto-extend.
D. You need to alter the Recycle Bin to add the RETENTION GUARANTEE setting.

单项选择题A user named Arren is executing this query：   select table_name，operation，undo_sql  from  flashback_transaction_query t，  （select versions_xid as xid  from employees versions between scn minvalue and maxvalue  where employee_id = 123） e  where t.xid = e.xid；   When the query runs，he receives an ORA-01031： insufficient privileges error. Since the user owns the employees table，you know that it is not the problem.  Which of the following SQL statements will correct this problem？（）

A. GRANT SELECT ANY TRANSACTION TO ARREN
B. GRANT SELECT ON FLASHBACK_TRANSACTION_QUERY TO ARREN
C. GRANT SELECT_ANY_TRANSACTION TO ARREN
D. GRANT FLASHBACK TO ARREN
E. GRANT SELECT ANY VIEW TO ARREN

单项选择题Over the course of a day，a department performed multiple DML statements （inserts， updates， deletes） on multiple rows of data in multiple tables. The manager would like a report showing the time， table name，and DML type for all changes that were made. Which Flashback technology would be the best choice to produce the list？（）

A. Flashback Drop
B. Flashback Query
C. Flashback Transaction Query
D. Flashback Versions Query
E. Flashback Table

多项选择题WhichofthefollowingstatementsaretrueregardingtheRecycleBin？（）

A. The Recycle Bin is a physical storage area for dropped objects.
B. The Recycle Bin is a logical container for dropped objects.
C. The Recycle Bin stores the results of a Flashback Drop operation.
D. The objects in the Recycle Bin are stored in the tablespace in which they were created.

多项选择题WhichofthefollowingOraclefeaturesutilizetheundotablespace？（）

A. Flashback Query
B. Flashback Drop
C. Flashback Table
D. Flashback Database
E. Transaction Processing
F. Recycle Bin