With the column attribute SYSTEM DEFAULT COMPRESSION, additional space can be saved if columns contain the system default very often.

当使用列属性 SYSTEM DEFAULT COMPRESSION 时，如果列中包含很多的系统默认值，则可以节省更多的空间。

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You can use the grep utility to search the system user attribute defaults in the file. Depending on the placement of comments in the file, one of the following will extract just the default stanza

可以使用 grep 工具在文件中搜索系统用户属性默认值。

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