得到EXPLAIN输出之后，查看查询的结果集是如何生成的，然后考虑是否可以采用其他访问路径。
Once you have the EXPLAIN output, look at how the query's result set is generated, and then consider alternative access path possibilities.
这个查询生成的结果是数据的XML表示。
The result from this query is an XML representation of your data.
PHP 用于与 DB2 通信，以及为动态显示查询结果的框架生成内容。
PHP is used to communicate with DB2 and to build the content for the frame showing query results dynamically.
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