[MySQL参数取值] Status取值ERROR 1193 (HY000): Unknown system_MySQL

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[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>   

 

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