Oracle 学习笔记
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Dynamic Sampling Levels
The sampling levels are as follows if the dynamic sampling level used is from a cursor hint or from the OPTIMIZER_DYNAMIC_SAMPLING initialization parameter:Level 0: Do not use dynamic sampling.Level 1...
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dbms_utility.get_time
dbms_utility.get_time 返回当前时间的1/ 100秒,它是用以前后两个取点做对比的，单个是没有具体意义的，就是用来取差值的！
