mysql参数中innodb_buffer_pool_size大小怎么设置

开发技术作者：小新 2024-04-03 04:05:01

这篇文章主要为大家展示了“mysql参数中innodb_buffer_pool_size大小怎么设置”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起�...

这篇文章主要为大家展示了“mysql参数中innodb_buffer_pool_size大小怎么设置”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“mysql参数中innodb_buffer_pool_size大小怎么设置”这篇文章吧。

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，