A "No results found" message if an error-free query found no results.
如果查询没有错误，但却未找到结果，就会输出一个 “No results found” 消息。
The client application makes use of the following routines provided by the RPC runtime to query free the interface details.
客户机应用程序使用RPC运行时提供的以下例程查询接口的详细信息。
This must be done carefully, however, because too much free space will mean an abundance of index pages, which could negatively impact query performance and even insert processsing itself.
所以这样做时要小心，不过，太多的自由空间意味着大量的索引页，这对查询的性能乃至 insert 处理本身都会产生负面影响。
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