试题详情
- 单项选择题在Oracle中,在以下情形建立位图索引可以获得较好的性能()。
A、在列值唯一的列上建立
B、在列值相差很小的列上建立
C、在列值频繁重复的列上建立
D、在用于保存位图的列上建立
- C
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