The rules-of-thumb (ROT) function provides a powerful way to analyze long-term data and to present recommendations to the users on how to tune their systems.
经验法则（ROT）功能提供一种非常有效的方式来分析长期数据以及向用户提供系统调优方法建议。
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Figure 7 shows a sample ROT result matrix that is displayed after you have started ROT analysis on the PWH data.
图7所示为启动P WH数据的ROT分析后所显示的示例ROT结果矩阵。
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Once long-term data has been stored into the PWH tables, you can use the predefined ROT or define your own ROT to analyse the data in the PWH.