MySQL 8.3 Release Notes
给定连接ID，启用性能模式instrumentation的线程。产生结果集，指示启用了多少线程。已经启用的线程不计入。
启用特定连接的连接ID：
mysql> CALL sys.ps_setup_enable_thread(225);
+------------------+
| summary |
+------------------+
| Enabled 1 thread |
+------------------+启用当前连接：
mysql> CALL sys.ps_setup_enable_thread(CONNECTION_ID());
+------------------+
| summary |
+------------------+
| Enabled 1 thread |
+------------------+