【第33题】【063题库】2019年OCP12c认证1Z0-063考试题库大全
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我要咨询OCP 12c考试考3科，分别是071、062、063，之前071和062都已经做过解析，这里开始063题库解析，希望对考063的同学有帮助，顺利通过063考试。
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33题、You want to reduce fragmentation and reclaim unused space for the sales table but not its dependent objects.
During this operation, you want to ensure the following:
i. Long-running queries are not affected.
ii. No extra space is used.
iii. Data manipulation language (DML) operations on the table succeed at all times throughout the process.
iv. Unused space is reclaimed both above and below the high water mark.
Which alter TABLE option would you recommend?
A. DEALLOCATE UNUSED
B. SHRINK SPACE CASCADE
C. SHRINK SPACE COMPACT
D. ROW STORE COMPRESS BASIC
Answer: C
(解析：如果在释放表碎片的释放不影响当前的操作，那么应该在 shrink 的时候加上 compact 选项，等业务空闲的时候再 DEALLOCATE UNUSE，所以 shrink space 可以分为两部分进行操作。)
