例如，如果需要分析压缩的Apache日志文件，就必须解压它，处理数据，然后重新压缩它。

If you need to analyze a compressed Apache log file, for instance, you must decompress it, process the data, then re-compress it.

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此时，您需要将 initrd 文件系统重新压缩到一个映像中，并替换 /boot 目录下的原有映像。

At this time, you need to recompress the initrd file system to an image and replace the original one under the /boot directory.

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对于oltp压缩也是不支持列删除，但是我们可以把列设置为unused的，避免解压缩和重新压缩操作队它的影响。

OLTP compression-drop column is supported, but internally the database sets the column UNUSED to avoid long-running decompression and recompression operations.

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