先看帮助手册。再用GOOGLE一定会有答案的。SHOW PROFILES displays a list of the most recent statements sent to the master. The size of the list is controlled by the profiling_history_size session variable, which has a default value of 15. The maximum value is 100. Setting the value to 0 has the practical effect of disabling profiling.
The default value is 15. The maximum value is 100.
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