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 andclean 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 beeasily 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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