大数据就业实战培训 Oracle就业实战培训
Oracle的OCP认证考试从今年起发生了一系列的变更，其中052考题几乎全变，且不变的加入新题，考试难度加大，这里收集整理了一些052考试新题，希望对大家通过OCP有帮助。
53、Which is true about unusable indexes?
A. Rebuilding an unusable index always requires at least twice the space of the original index
B. Rebuilding an unusable index always allows DML statements on the index’s table during the rebuild.
C. Rebuilding occurs automatically when an unusable index is chosen by the optimizer when creating an execution plan
D. Rebuilding an unusable index creates a new segment after dropping the unusable index.
Correct Answer: D
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