...描(index range scan)、索引唯一扫描 (index unique scan)、索引跳跃式扫描 (index skip scan)、位图索引扫描(bitmap index scan), 其中前5种在本系列课程的索引章 节部分已经讲解了其理论和示例 。位图索引示例如下:
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该算法引入了线性索引技术和LZC算法标志位图,采用了类似于SPIHT算法的扫描顺序,将待编码流按不同种类进行算术编码。
The algorithm integrates the linear indexing technique and flag map which LZC adopts, USES the scan order which is the same of SPIHT algorithm, sends the coding stream into MQ in code process.
在利用位图索引求解成员查询时,减少对位图的重复扫描可以有效地提高查询的效率。
When membership queries are evaluated with bitmap indices, the performance can be improved if the number of bitmaps to be scanned is reduced.
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