Oracle introduced index compression since version 8i.

Oracle从版本8i开始就引入了索引压缩。

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Exploring XML data and index compression for storage efficiency and performance.

使用XML数据和索引压缩提高存储效率和性能。

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Multidimensional Clustering (V8 GA) : Implements a form of index compression by using block indexes, one index entry for thousands of records.

多维集群(V 8 GA)：使用块索引，数千个记录共用一个索引条目，实现索引压缩。

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That said, the Bank of American Merrill Lynch High-Grade Bond Master Index is up 3.75% through April 30 as a result of spread compression across the credit markets from the more lofty levels of the fourth quarter.

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