xscan

For each row fetched , the XSCAN operator processes the corresponding XML document .

对于所获取的每一行，XSCAN操作符将处理相应的XML文档。

There can be many documents where this second predicate is not true , and the XSCAN may still perform a lot of work to weed them out .

可能存在这样一些文档，其中第二个谓词不为真，那么XSCAN仍将执行一些操作来排除这些文档。

DB2 uses the XSCAN operator to traverse XML document trees and , if needed , to evaluate predicates and extract document fragments and values .

DB2使用XSCAN操作符来遍历XML文档树，如需要，还将计算谓词和提取文档片断和值。

XSCAN is not an " XML table scan " but it can appear in an execution plan after a table scan to process each of the documents .

XSCAN不是“XML表扫描”，但在表扫描之后，它可以出现在执行计划中，用来处理每个文档。

For each row , the nested loop join ( NLJOIN ) operator passes a pointer to the corresponding XML document to the XSCAN operator .

对于每一行，嵌套循环连接（NLJOIN）操作符把指向相应的XML文档的指针传递给XSCAN操作符。

As such , the NLJOIN does not act as a classical join with two input legs , but facilitates access to the XML data for the XSCAN operator .

同样地，NLJOIN并没有充当拥有两个输入的标准连接，而是协助XSCAN操作符来访问XML数据。