REOPT once: query optimization occurs once at query execution time, when the query is executed for the first time.

REOPT ONCE：查询执行中只发生一次查询优化，即在查询第一次执行时。

youdao

The only remedy is to invoke the XML parser at query execution time to "look into" the XML documents such that search conditions can be evaluated.

惟一的补救方法是，在执行查询时调用 XML 解析器来“搜索” XML 文档，以便找到符合搜索条件的内容。

youdao

At this step, you need to use the tools discussed above to get statistics on the query: its response time, its detailed execution plan, and costs for later in-depth analysis.

在这一步中，需要使用上面讨论的工具来获取该查询的统计数据：其响应时间、详细的执行计划和成本，以便稍后进行深入分析。

youdao