因为锁等待导致的慢查询不会改变状态变量slow_queries值

none)>show global status like 'Slow%';
+---------------------+-------+
| Variable_name       | Value |
+---------------------+-------+
| Slow_launch_threads | 0     |
| Slow_queries        | 8     |
+---------------------+-------+

2 rows in set (0.01 sec)

session 1：

>lock table t8 write;
Query OK, 0 rows affected (0.01 sec)

session2:

>select count(*) from t8;
session2一直等待

session1 unlock tables;

session2执行

+----------+
| count(*) |
+----------+
|      148 |
+----------+
1 row in set (17.58 sec)

再次查看状态变量

show global status like 'Slow%';
+---------------------+-------+
| Variable_name       | Value |
+---------------------+-------+
| Slow_launch_threads | 0     |
| Slow_queries        | 8     |
+---------------------+-------+

可见没有影响到状态变量