mysql参数中innodb_buffer_pool_size大小怎么设置

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mysql> show global variables like 'innodb_buffer_pool_size';

+-------------------------+-----------+
| Variable_name           | Value     |
+-------------------------+-----------+
| innodb_buffer_pool_size | 134217728 |
+-------------------------+-----------+
1 row in set (0.00 sec)

那么如何设置该参数大小呢？首先查看运行时buffer pool相关数据指标：

mysql> show global status like 'Innodb_buffer_pool_pages_data';
+-------------------------------+-------+
| Variable_name                 | Value |
+-------------------------------+-------+
| Innodb_buffer_pool_pages_data | 314   |
+-------------------------------+-------+
1 row in set (0.00 sec)

mysql> show global status like 'Innodb_buffer_pool_pages_total';
+--------------------------------+-------+
| Variable_name                  | Value |
+--------------------------------+-------+
| Innodb_buffer_pool_pages_total | 8191  |
+--------------------------------+-------+
1 row in set (0.00 sec)

mysql> show global status like 'Innodb_page_size';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| Innodb_page_size | 16384 |
+------------------+-------+
1 row in set (0.00 sec)

上述三项指标的含义如下：

Innodb_buffer_pool_pages_data
The number of pages in the InnoDB buffer pool containing data. The number includes both dirty and
clean pages.

Innodb_buffer_pool_pages_total
The total size of the InnoDB buffer pool, in pages.

Innodb_page_size
InnoDB page size (default 16KB). Many values are counted in pages; the page size enables them to be
easily converted to bytes

计算Innodb_buffer_pool_pages_data/Innodb_buffer_pool_pages_total*100%
当结果 > 95% 则增加 innodb_buffer_pool_size， 建议使用物理内存的 75%
当结果 < 95% 则减少 innodb_buffer_pool_size， 

建议设置大小为： Innodb_buffer_pool_pages_data* Innodb_page_size * 1.05 / (1024*1024*1024)

命令如：SET GLOBAL innodb_buffer_pool_size= 32423423：单位kb

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