答案解析
Which three are true is true about unusable indexes
- A、Rebuilding an unusable index creates a new object.
- B、An index can be set unusable manually.
- C、An unusable index can be bypassed by the optimizer when creating an execution plan.
- D、An index can become unusable automatically due to actions performed on other objects.
- E、Rebuilding an unusable index requires at least one row to exist in the indexed table
- F、Rebuilding an unusable index reuses the space from the original index segment.
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