1z0-071 Exam Dumps | You execute this command: ALTER TABLE employees SET UNUSED (department

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Question 144/144

You execute this command:
ALTER TABLE employees SET UNUSED (department_id);
Which two are true?

A. A query can display data from the DEPARTMENT_ID column.

B. The storage space occupied by the DEPARTMENT_ID column is released only after a COMMIT is issued.

C. The DEPARTMENT_ID column is set to null for all tows in the table

D. A new column with the name DEPARTMENT_ID can be added to the EMPLOYEES table.

E. No updates can be made to the data in the DEPARTMENT_ID column.

F. The DEPARTMENT_ID column can be recovered from the recycle bin

Correct Answer: D,E

D . True, after setting the DEPARTMENT_ID column to UNUSED, you can add a new column with the name DEPARTMENT_ID to the EMPLOYEES table. The UNUSED clause does not delete the column, it only marks it as no longer being used.
E . True, once a column is marked as UNUSED, you cannot make updates to it. It becomes inaccessible for DML operations.
A, B, C, and F are not correct because: A. Once a column is set to UNUSED, it is not available for queries. B. The storage space is not immediately released after issuing a COMMIT; instead, the actual removal and space reclamation happen when you subsequently issue the DROP UNUSED COLUMNS operation. C. The DEPARTMENT_ID column is not set to null; instead, it's marked as UNUSED, which means it is no longer available for use. F. UNUSED columns are not placed into the recycle bin; they are just marked for deletion, and space can be reclaimed with the DROP UNUSED COLUMNS command.
Reference:
Oracle documentation on ALTER TABLE: Oracle Database SQL Language Reference Understanding ALTER TABLE SET UNUSED: Oracle Database Administrator's Guide

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