[MySQL参数取值] Status取值ERROR 1193 (HY000): Unknown system variable 'Innodb_buffer_pool_read_requests'

variables参数值，可以通过 select @@xx取值，如下：

[sql] 
mysql> show variables like 'innodb_buffer_pool_size';  
+-------------------------+-------------+  
| Variable_name           | Value       |  
+-------------------------+-------------+  
| innodb_buffer_pool_size | 22020096000 |  
+-------------------------+-------------+  
1 row in set (0.00 sec)  
  
  
mysql> select @@innodb_buffer_pool_size;  
+---------------------------+  
| @@innodb_buffer_pool_size |  
+---------------------------+  
|               22020096000 |  
+---------------------------+  
1 row in set (0.00 sec)  
  
  
mysql>

而status参数就不行，why？

[sql] 
mysql> show status like 'Innodb_buffer_pool_read_requests';  
+----------------------------------+-------------+  
| Variable_name                    | Value       |  
+----------------------------------+-------------+  
| Innodb_buffer_pool_read_requests | 15551159458 |  
+----------------------------------+-------------+  
1 row in set (0.00 sec)  
  
  
mysql> select @@Innodb_buffer_pool_read_requests;  
ERROR 1193 (HY000): Unknown system variable 'Innodb_buffer_pool_read_requests'  
mysql>