MySQL使用show status like '%Thread%'，得到如下显示：
1
1960+---------------------------+-------+
| Variable_name | Value |
+---------------------------+-------+
| Delayed_insert_threads | 0 |
| Slow_launch_threads | 0 |
| Threads_cached | 23 |
| Threads_connected | 399 |
| Threads_connected_reserve | 91 |
| Threads_created | 2173 |
| Threads_running | 3 |
+---------------------------+-------+
关于这个显示，有一些疑问。我的问题如下：
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