如前所述，Portal Search包括用来启动爬网程序和索引维护处理的调度程序，其中索引维护处理可以删除过时的文档和断开的链接。

As described above, Portal Search includes a scheduler to start the crawlers and the index maintenance process that removes outdated documents and broken links.

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或者，您可能将一系列网页从一个目录或网站移动到另一个目录或网站，结果导致已将旧url用作书签的访问者断开链接。

Or maybe you have a bunch of web pages that were moved from one directory or website to another, resulting in broken links for visitors who have bookmarked the old URLs.

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您还知道，符号链接可以断开，但随后的写操作可能会创建一个新文件。

You have also seen that symbolic links can be broken but that subsequent write operations may create a new file.

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