为什么MySQL存储过程、函数和触发器对性能不好

As we can see, func3 (with four dead code calls that will never be executed, otherwise identical to func1) runs almost 3x slower compared to func1(); func3_nope() is identical in terms of response time to func3().

Visualizing All System Calls From Functions

To figure out what is happening inside the function calls, I used performance_schema/sys schema to create a trace with ps_trace_thread() procedure.

1.Get the thread_id for the MySQL connection:

mysql> select THREAD_ID from performance_schema.threads where processlist_id = connection_id();  
+-----------+  
| THREAD_ID |  
+-----------+  
|        49 |  
+-----------+  
1 row in set (0.00 sec)  

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