MySQL 内存和CPU优化相关的参数

mysql> SHOW GLOBAL STATUS LIKE ‘innodb%read%‘;
+---------------------------------------+---------+
| Variable_name                         | Value   |
+---------------------------------------+---------+
| Innodb_buffer_pool_read_ahead_rnd     | 0       |
| Innodb_buffer_pool_read_ahead         | 0       |
| Innodb_buffer_pool_read_ahead_evicted | 0       |
| Innodb_buffer_pool_read_requests      | 612     |
| Innodb_buffer_pool_reads              | 179     |
| Innodb_data_pending_reads             | 0       |
| Innodb_data_read                      | 5115904 |
| Innodb_data_reads                     | 189     |
| Innodb_pages_read                     | 178     |
| Innodb_rows_read                      | 0       |
+---------------------------------------+---------+
10 rows in set (0.00 sec)

#多核CPU
innodb_read_io_threads
innodb_write_io_threads

#内存
缓冲池命中率=
Innodb_buffer_pool_read_requests/(
Innodb_buffer_pool_read_requests+Innodb_buffer_pool_read_ahead+Innodb_buffer_pool_reads)
平均每次读取字节数
Innodb_data_read/Innodb_data_reads

Innodb_data_reads:表示从物理磁盘读取页的次数
Innodb_buffer_pool_read_ahead：预读的次数
Innodb_buffer_pool_read_ahead_evicted：预读的页，但是没有被读取就从缓冲池中被替换的页的数量，一般用来判断预读的频率
Innodb_buffer_pool_read_requests：从缓冲池中读取页的次数
Innodb_data_read：一共读取的字节数
Innodb_data_reads：发起读取请求的次数，每次读取可能需要读取多个页