尽管b-tree索引被用在标准的交叉记录(junction record)里,但是我们能够提高9i查询的性能,在这些查询里判断述词(predicate)会用到低基数数据列。
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Although after the experts trying to decipher, record contents still do not complete the important basis of reason, plane crash shortage. (2) the plane junction were missing.
虽经专家竭力破译,记录内容仍然不完整,空难原因的重要依据不足。(2)飞机尾翼失踪。
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