Therefore it is important to ensure that the user or group has privileges to write to the specified directories, while the user id expected to access the files also has access.

因此一定要确保这个用户和组对指定的目录有写特权，而且用来访问文件的用户 id 也有访问权。

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For example, the index idx1 on author id attributes is defined as DOUBLE since it is expected that these IDs are numeric values.

例如，将author id属性上的索引idx 1定义为DOUBLE，是希望这些id为数值。

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