要查看性能是否还可以接受，您可能想对预期查询应用一些基本数学函数，当然，还要在您的环境中测试那些查询。
To see if performance is acceptable, you may want to apply some basic math to anticipated queries and, of course, test them in your environment.
查询是数据库系统中最基本也是最常用的一种操作，因此查询是否具有较快的执行速度，已成为数据库用户和设计者极其关心的问题。
Query is one of the basic and commonly using operations in DBMS. So whether the query has the fast execution speed has become a core problem for the users and designers of DBMS.
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