Use Step 3 to calculate n, the number of task executions whose cumulative execution time is sufficiently large.
使用步骤3计算n，这是执行task的次数，这些次执行的累计时间必须足够大。
The goal behind measuring n executions of task (n >= 1) is to make the cumulative execution time so large that all the time measurement errors I discuss above become insignificant.
度量 task 的 n 次执行的目的在于，让累计的执行时间足够大，从而减少前面讨论的所有时间度量误差的影响。
Answer: you can always turn off global logging by setting global_logging to N. However, if you want to shave every millisecond from your stored procedure's execution time, comment out all CALL DB2.
解答：可以通过将global_logging设置成n来全局地关闭日志功能。然而，如果希望节省存储过程执行时的每一毫秒的时间，那么在确信SQL - PL和外部存储过程都已经准备好之后，就可以注释掉所有的CALL DB2。
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