innodb_buffer_pool_size 大小建议

mysql> SHOW GLOBAL STATUS LIKE 'Innodb_buffer_pool_pages_data';

+-------------------------------+-------+
| Variable_name                 | Value |
+-------------------------------+-------+
| Innodb_buffer_pool_pages_data | 1388  |
+-------------------------------+-------+
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 | 131071 |
+--------------------------------+--------+
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)

'Innodb_buffer_pool_pages_data' X 100 / 'Innodb_buffer_pool_pages_total'

当结果 > 95% 则增加 innodb_buffer_pool_size， 建议使用 ram total 75%
当结果 < 95% 则减少 innodb_buffer_pool_size，
建议 'Innodb_buffer_pool_pages_data' X 'Innodb_page_size' X 1.05 / (1024*1024*1024)