多项选择题

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

A. Ensure that database is running with version 10.1 compatibility.
B. Enable Flashback Logging.
C. Enable Supplemental Logging.
D. Ensure that the database is running with version 10.0 compatibility.
E. Ensure that the database is in ARCHIVELOG mode.

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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