ocp-v13-043

QUESTION 43
View the following SQL statements:
Transaction T1 INSERT INTO hr.regions VALUES (5,’Pole’);COMMIT;
Transaction T2 UPDATE hr.regions SET region_name=’Poles’ WHERE region_id = 5; COMMIT;
Transaction T3 UPDATE hr.regions SET region_name=’North and South Poles’ WHERE region_id = 5;
You want to back out transaction T2. Which option would you use?
A. It is possible, but transaction T3 also backs out.
B. It is possible with the NOCASCADE_FORCE option.
C. It is possible with the NONCONFLICT_ONLY option.
D. It is not possible because it has conflicts with transaction T3.
Correct Answer: B

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查看下面的SQL语句：
Transaction T1 INSERT INTO hr.regions VALUES (5,’Pole’);COMMIT;
Transaction T2 UPDATE hr.regions SET region_name=’Poles’ WHERE region_id = 5; COMMIT;
Transaction T3 UPDATE hr.regions SET region_name=’North and South Poles’ WHERE region_id = 5;
你想退出事务T2。你会使用哪个选项？

B.这是可能的nocascade_force选项。

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