【第41题】【062题库】2019年OCP认证062考试新题

41题、choose one

Examine the details of the uncompressed, non-partitioned heap table CITIES.

Name                 Null?                     Type

CITYID                 NOT NULL           NUMBER (4)

CITY_NAME                                     VARCHAR2 (50)

Examine the command:

SQL>ALTER TABLE cities SHRINK SPACE COMPACT;

What must you do before executing it?

A) Ensure there are no pending transactions on the table.

B) Disable all indexes on the table .

C) Ensure free space that is approximately equal to the space used by the table should be available.

D) Enable row movement is enabled.

Answer：D

(解析：想要shrik表的空间，因为要涉及到行的移动，所以要先把行移动功能打开。)