【2019年8月版本】OCP 071认证考试最新版本的考试原题-12
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我要咨询【2019年8月版本】OCP 071认证考试最新版本的考试原题-12-CUUG整理
OCP的071考试,在8月份左右全部换了新题,近期考试的题也全部不包括之前的题库了,这次Oracle更新071考试题库,虽然全都是新题,但跟之前的相比也有关联,比如把之前的考题稍微变换一下数字、更新一下日期、或者再加一个错误选项等等。
对于2019年8月份的更新,我们CUUG已经进行了收集整理,并给出初步的答案和讲解,仅供参考,希望对考OCP 071认证的同学有帮助。
Choone two
Which three statements are true about dropping and unused columns in an Oracle database?
A) A primary key column referenced by another column as a foreign key can be dropped if using the CASCADE option.
B) A DROP COLUMN command can be rolled back
C) An UNUSED column's space is redaimed automatially when the block containing that column is next queried
D) An UNUSED column's space is redaimed automatially when the row containing that column is next queried.
E) Partition key columns cannot be dropped.
F) A column that is set to NNUSED still counts towards the limit of 1000 columns per table.
Answer:AE
(解析:
删除主键列时可以加 cascade 选项,同时把主外键约束一起删除。
ORA-12984: 无法删除分区列,E 对;