当有关表的统计信息不准确时，可能会造成性能问题。
When statistical information about tables is not accurate, it may cause performance problems.
以下是返回的性能统计数据的说明。
Here is a description of the performance statistics returned.
我在本文中只讨论解决以下这些常见性能问题所需的统计技术。
I'll present just enough statistics to address these common performance questions.
本文统计了大量压缩机的性能测试数据。
This paper presents a number of the performance test data of compressor.
目前，大多数化工批过程调度系统计算速度缓慢且动态性能较差。
Recently, the most batch process scheduling systems have problem on calculate speed and dynamic performance.
目前，大多数化工批过程调度系统计算速度缓慢且动态性能较差。
Recently, the most batch process scheduling systems have problem on calculate speed and dynamic performance.
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