26.4.5.13 ps_is_thread_instrumented()函数

返回YESNO以指示是否为给定的连接 ID 启用了性能模式检测;如果 ID 未知,则返回UNKNOWN;如果 ID 为NULL则返回NULL

Parameters
  • in_connection_id BIGINT UNSIGNED:连接 ID。这是 Performance Schema threadstable 的PROCESSLIST_ID列或SHOW PROCESSLIST输出的Id列中给定类型的值。
Return Value

ENUM('YES','NO','UNKNOWN')值。

Example
mysql> SELECT sys.ps_is_thread_instrumented(43);
+-----------------------------------+
| sys.ps_is_thread_instrumented(43) |
+-----------------------------------+
| UNKNOWN                           |
+-----------------------------------+
mysql> SELECT sys.ps_is_thread_instrumented(CONNECTION_ID());
+------------------------------------------------+
| sys.ps_is_thread_instrumented(CONNECTION_ID()) |
+------------------------------------------------+
| YES                                            |
+------------------------------------------------+