In the previous section you learned about one type of access method, index scan (IXSCAN), and one type of join method, nested loop join (NLJOIN).

在之前的部分您已经了解了一种类型的访问方法，即索引扫描(IXSCAN)，和一种类型的联接方法，即嵌套循环联接(NLJOIN)。

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Dynamic analysis tools today make it easy to add a missed section to a scan, but it is often hard to determine if parts were indeed missed (and if so, which ones).

当今的动态分析工具很容易就可以将遗漏的部分添加到扫描中，但是通常很难确定这些部分是否确实被遗漏了(如果确实遗漏，是哪些)。

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For more information about merge scan joins, refer to the appropriate information center link in the Resources section for your DB2 platform.

要了解有关合并扫描联接的更多信息，请参考参考资料部分中针对您的DB 2平台的适当的信息中心链接。

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These are but a brief scan of threats and opportunities, please offer your ideas in the comments section below.

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