以下为句子列表：
英文: In a quick test on a table with 100,000 rows loaded using a sequence, a normal index was used for most queries returning up to 30 rows, as was the reverse key index, however, when the number of rows went up to 1,000,000 the reverse key index was never use
中文: 在一个用一个序列载入并含100,000行的表上做一个快速的测试，分别用普通索引和逆序索引查询并返回30行数据，当行数增长到1,000,000，将不再使用逆序索引而是每次使用全表扫描。
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英文: Reverse key index cannot be used for range scan.
中文: 回复：建了反向索引，为什么系统不使用索引了？
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