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View the following SQL statements: Transaction T1 SQL> INSERT INTO hr.regions 2 VALUES (5,'Pole'); 3 COMMIT; Transaction T2 SQL> UPDATE hr.regions 2 SET region_name='Poles' 3 WHERE region_id = 5; 4 COMMIT; Transaction T3 SQL> UPDATE hr.regions 2 SET region_name='North and South Poles' 3 WHERE region_id = 5; You want to back out transaction T2. Which option would you use?
Correct Answer: B
Explanation/Reference: Explanation: Table 12-2 Flashback TRANSACTION_BACKOUT Options CASCADE Backs out specified transactions and all dependent transactions in a post-order fashion (that is, children are backed out before parents are backed out). Without CASCADE, if any dependent transaction is not specified, an error occurs. NOCASCADE Default. Backs out specified transactions, which are expected to have no dependent transactions. First dependent transactions causes an error and appears in *_FLASHBACK_TXN_REPORT. NOCASCADE_FORCE Backs out specified transactions, ignoring dependent transactions. Server runs undo SQL statements for specified transactions in reverse order of commit times. If no constraints break and you are satisfied with the result, you can commit the changes; otherwise, you can roll them back. NONCONFLICT_ONLY Backs out changes to nonconflicting rows of the specified transactions. Database remains consistent, but transaction atomicity is lost.